A Package for calculating elastic tensors of rhombohedral Phases by using second-order derivative with Wien2k Package
|
|
- Arron Gallagher
- 6 years ago
- Views:
Transcription
1 IR ELAST + WIEN2k A Package for calculating elastic tensors of rhombohedral Phases by using second-order derivative with Wien2k Package User s guide, Rhom-elastic_13.1 (Release ) Morteza Jamal Ghods City-Tehran-Iran 1
2 MANDATORY CONDITIONS: In any publication in the scientific literature please reference the program as follows: M. Jamal, Rhom-elastic, (2013). ACKNOWLEDGMENT I gratefully appreciate B.Z. Yanchitsky for fruitful discussions, P. Blaha and S. Jalali Asadabadi for suggestions, and Carol Phillips for editing. For suggestions or bug reports please contact the author by m_jamal57@yahoo.com 2
3 1- Introduction Rhom-elastic is a Package for finding elastic constants of rhombohedral symmetries with Wien2k. This Package calculates elastic constants by second-order derivative ( E (δ) ) of Polynomial fit ( E=E(δ) ) of Energy vs. strains (δ) at zero strain (δ =0). This called energy approach[1]. 2- Background theory (energy approach) Elastic constants are defined by means of a Taylor expansion of the total energy for the system, with respect to a small strain ( ) of the lattice. If we consider the bravais lattice vectors of a rhombohedral crystal structure as a matrix form the distortion of the lattice ( ) is expressed by mul tiplying with a symmetric ( ) distortion matrix i.e. ( ), which is written as, And in Voigt notation ( It is often convenient to change to the Voigt notation in order to reduce the number of indices. The Voigt notation replaces 1, 2, 3, (and ) 4, (and ) 5, (and ) 6 ) 3
4 We express the energy of the strained system by means of a Taylor expansion in the distortion parameters, The linear terms vanish if the strain causes no changes in the volume of the crystal. Otherwise, are related to the strain on the crystal and are elastic constants and is the volume of unstrained rhombohedral system and we use it to evaluate the elastic constants. There are seven ( six) independent elastic constants for a rhombohedral (symmetry group number between 149 and 167) symmetry, called C 11, C 12, C 13, C 14, C 15 ( C 15 =0), C 33, and C 44. Since we have seven independent elastic constants, we need seven different strains to determine these elastic constants. For simplicity in writing the equations used in the rhom-elastic Package, it is convenient to rewrite the above equation as : Which τ represents a linear combination of strain components and C, a linear combination of elastic constants. Therefore the seven distortions used in the rhom-elastic Package are described as following: 1), 2), 3), 4), 4
5 5), 6), 7), 5
6 3- File structure and program flow The following table describes input and output files for each program of the Rhom-elastic Package. Program needs generates R_set_elast_lapw case.struct init.struct runcommand1 runcommand2 pwdname command_init_lapw R_command_run_lapw R_setupc11, R_setupc12 R_setupc13, R_setupc14 R_setupc33,. getcalljobr makestructr init.struct pwdname runcommand1 runcommand2 init.struct.styp RHOM.job auto_init_lapw runcommand1 runcommand2.vper.styp RHOM.job number.strain StypX_Y.struct vol.optimize R_modifyjob_lapw R_calljob_lapw RHOM.job VstVene R_fitdivELC number.strain ELCorder.fit vol.optimize ELC.output.styp ELC.fit VstVene R_ana_elastc_lapw VstVene case.outputeos ELC.fit vol.optimize ELC.ps R_ana_elast_lapw ELC.output ELC-matrix case.output_elastic R_InverseELC ELC-matrix INVELC-matrix MassRho init.struct.rho vol.optimize R_ana_elastorder_lapw ELCorder.fit output-order sgroupcheck_lapw StypX_Y.struct case.struct command_intso_lapw.infso command_initu_lapw.infldau auto_initso_lapw.infso case.inso auto_initu_lapw.infldau case.inorb case.indm/c Bold font is OPTIONAL Italic bold font means it is the user s choice 6
7 3-1- Short description for input and output files case.struct init.struct pwdname runcommand1/2 Is a Wien2k standard struct file. Is a copy of the case.struct file. Contains the name of the present work directory. Contains the run commands for running. It looks similar to: run_lapw ec p in1new 2 auto_init_lapw A C-shell program which automatically runs the initialization. It looks similar to:.vper.styp RHOM.job #!/bin/csh -f set RM = not if ( $RM == 'not' ) then init_lapw -vxc 13 -ecut -6 -mix 0.2 -numk b else init_lapw -red 0 -vxc 13 -ecut -6 -mix 0.2 -numk b endif Defines the percent of changes for different strains. Defines the type of strain. A C-shell program which calculates the energy for each strain by using the Wien2k Package. It looks similar to: #!/bin/csh -f #STRAIN TYPE IS 1 #Modify this script according to your needs unalias rm set co = 1 set name set bj set file = `pwd` set file = $file:t if (-e VstVene ) then set i=`/bin/ls VstVene* wc ` echo " saving pervious VstVene to VstVene_$i[1]" cp VstVene VstVene_$i[1] rm VstVene endif # # to reuse previous scf runs (without a new scf run) set answscf=y # and use the same "savename". # When you make modifications (RKmax, k-mesh, XC-potentials) choose # answscf=no and a new savename (eg. "_pbe_rk8_1000k"). set answscf=y set savename= 7
8 if (-e cscl.clmsum && \! -z cscl.clmsum) then x dstart -super endif if (-e cscl.clmup && \! -z cscl.clmup ) then x dstart -super -up x dstart -super -dn endif foreach i ( \ ) echo "*******************************" echo $i set name=`echo "$name $i"` echo "*******************************" Styp1_-3.0 \ Styp1_-2.0 \ Styp1_-1.0 \ Styp1 0.0 \ Styp1 1.0 \ Styp1 2.0 \ Styp1 3.0 \ StypX_Y.struct VstVene number.strain case.outputeos A Wien2k struct file for each value of changes and for each strain type where X and Y denote type of strain and value of changes, respectively. The main information file, contains values of changes (strains) and energies for each type of strain, for the calculation of the elastic constant. Contains the number of strains. A Wien2k output of equation of states(eos). For finding the best values of elastic constants, find EOS and then copy the case.outputeos file in the "case" directory within the c11, c12, c13, c14, c15, and directories. Otherwise, it sets the optimized volume from the original struct file i.e. case.struct vol.optimize Contains the optimized volume. ELCorder.fit Contains the elastic constants for different values of order of fit. ELC.output Contains the elastic constants for order of fit =2 ELC.fit Contains the data to plot a curve of energy vs value of changes (strains) for each strain type. ELC-matrix Defines the elastic constant matrix for each symmetry. case.output_elastic Contains the final elastic constant values. INVELC-matrix Defines the inverse of elastic constant matrix. 8
9 .rho.infso.infldau Contains density of mass and atomic volume. Contains information for making the case.inso file for running spin-orbit coupling. Contains information for making the case.inorb and case.indm/c files for LDA+U calculations Flow and short description for programs The Rhom-elastic Package consists of several FORTRAN and SHELL SCRIPTS which are described below. A flowchart of the program is shown in the following diagram. R_set_elast_lapw : Makes an elast-constant directory in the present work directory ( PWD ) and c11, c12, c13, c14, c15, c33, and c44 directories in the elast-constant directory. The R_set_elast_lapw program also copies information of the "PWD" into the c11, c12, c13, c14, c15, c33, and c44 directories and calls "command_init_lapw", R_command_run_lapw, R_setupc11, R_setupc12, R_setupc13, R_setupc14, R_setupc15, R_setupc33, and R_setupc44 programs.. command_init_lapw : Gets information for making "auto_init_lapw". R_command_run_lapw : Gets the run commands for making RHOM.job. R_setupcX (X=11, 12, 13,.) : Gets the type of strain and calls the getcalljobr program. getcalljobr : Calls makestructr program and makes the RHOM.job file. makestructr : Makes the StypX_Y.struct files where X and Y stand for the type of strain and value of changes, respectively and the vol.optimize file. R_modifyjob_lapw : Edits the job files according to the user s needs. R_calljob_lapw : Calls the RHOM.job files for running. 9
10 R_ana_elast_lapw : Calls the R_ana_elastc_lapw program for calculating elastic constants then calculates the Voigt, Reuss, and Hill bulk, shear, and the Young modulus as well as the Poisson ratio. After that it calls the R_InverseELC and MassRho programs and calculates sound velocity and Debye temperature then makes two output files in the elastconstant directory with the name case.output_elastic and the INVELC-matrix which is the Elastic compliance constants generated by inverting the elastic constant matrix. At the end it calls R_ana_elastorder_lapw program. R_ana_elastc_lapw : Calls the R_fitdivELC program with appropriate libraries for calculating C11, C12, C13, and. R_InverseELC : Makes the Elastic compliance constants generated by inverting the elastic constant matrix. MassRho : Finds density of mass and atomic volume. R_ana_elastorder_lapw : Checks the sensitivity of the elastic constants to the order of fit. sgroupcheck_lapw : Finds the best value of tol in the sgroup[2] program and copies case.struct_sgroup as case.struct. 10
11 R_set_elast_lapw command_init_lapw generates auto_init_lapw R_command_run_lapw generates commandrun1/2 R_setupcX X=11, 12,. getcalljobr generates RHOM.job makestructr generates StypX_Y.struct sgroupcheck_lapw RHOM.job generates VstVene auto_init_lapw R_ana_elastorder_lapw generates ELCorder.fit R_ana_elast_lapw R_ana_elastc_lapw R_InverseELC MassRho ELASTIC CONSTANTS IS READY generates case.output_elastic and INVELC-matrix Program flow in Rhom-elastic 11 R_fitdivELC calls Libraries generates C 11, C 11 +C 12,. Dash arrow means user must run
12 4 Elastic constants calculation 1. Create a struct file and validate it by running "sgroupcheck_lapw". 2. If Spin-Orbit calculations are required run "command_initso_lapw. 3. If LDA+U calculations are required run "command_initu_lapw" and then "auto_initu_lapw". 4. Run "R_set_elast_lapw.. 5. Now you must adapt the job files according to your needs (you can run "R_modifyjob_lapw" in Terminal ). It is not necessary to do step 5 if you defined the COMMAND RUN commands in step Now you must run the job files (you can run "R_calljob_lapw" ). It will take some time. 7. Run "R_ana_elast_lapw".. This package calculates elastic constants by second-order derivative ( E (δ) ) of Polynomial fit ( E=E(δ) ) of Energy vs. strains ( є) at zero strain (δ =0) so, you must use values of strain around zero and from the viewpoint of fit convergence, we usually expect to see a minimum when we plot Energy vs. strain ( this Package plots it ). It is recommended that the sensitivity of the results is checked to the order of fit. This program shows them. 4-1 Notes about elastic constants calculation After using distortions for the calculation of C44, C14, and the symmetry of the rhombohedral compound changes and usually the number of atoms change. So when you run "command_initso_lapw" or "command_initu_lapw", in the section name of an atom, type "all <name of atom>" ( for example: all Mn). With this command, you use SO or LDA+U calculations for example for all Mn atoms. When you want to rerun job files with modifications in (RKmax, k-mesh, XC-potentials ) call the command_init_lapw and after that choose "answscf=no" in the RHOM.job files and a new "savename" (eg. "_use_pbe_rk8"). 12
13 Optionally you can specify more cases by rerunning R_setupcX (X=11, 12, 13, 14, 44, see section 4-3 ). Specify also your old cases. The old results will then be taken automatically into account without recalculation (unless you modify job files i.e: set answscf=no ). For the calculation of the best values of elastic constants, please find EOS and then copy case.outputeos in the "case" directory within the c11, c12, c13, and directories. Otherwise, it sets the optimized volume from the original struct file i.e. case.struct. 4-2 One calculation To calculate C 33 or C 44 calculation of C 44 : the following steps should be performed for example for 1. Make a directory for example c Make a "case" directory in c44 directory. 3. Make a "case.struct" file in the "case" directory and name it "init.struct". Create a "pwdname" file and write in it "case." and save it. 4. Run the command_init_lapw 5. chmod +x auto_init_lapw 6. For SO calculations, run the command_initso_lapw. 7. For LDA+U calculations, run the command_initu_lapw and auto_initu_lapw To avoid step 10, you can run R_command_run_lapw for setting the COMMAND RUN commands for making RHOM.job. 8. Run the R_setupc44 program. 9. chmod +x RHOM.job file. 10. Modify the RHOM.job file. 11. Call RHOM.job 12. Call R_ana_elastc_lapw 4-3 Run with more data points Optionally you can specify more data points, for the calculation of the elastic constants, by rerunning R_setupcX (X=11, 12, 13, ). Specify also your old data points. The old results will then be taken automatically into account without recalculation ( unless you modify the job files i.e: set answscf=no ). Please do the following steps for this goal for example for c Cd to the elast-constant directory. 2. Cd to the c44 directory. 3. cd the case directory. 3-1) To avoid step 6, you can run R_command_run_lapw for setting the COMMAND RUN commands for making the RHOM.job. 13
14 4. Run the R_setupc44 program. 5. If you want to rerun the job files with modifications in (RKmax, k-mesh, XCpotentials ) call command_init_lapw and then choose "answscf=no" in RHOM.job files and a new "savename" (eg. "_use_pbe_rk8"). 6. Modify the RHOM.job file. 7. Call RHOM.job 8. Call R_ana_elastc_lapw 4-4 Elastic constants calculation for Al2O3 Al2O3 compound is a test case for elastic constants calculation. The Al2O3 structure is described in detail in the following: Al2O3 R LATTICE,NONEQUIV.ATOMS: 2167_R-3c MODE OF CALC=RELA unit=bohr ATOM 1: X= Y= Z= MULT= 4 ISPLIT= 4 ATOM 1:X= Y= Z= ATOM 1:X= Y= Z= ATOM 1:X= Y= Z= Al1 NPT= 781 R0= RMT= Z: 13.0 LOCAL ROT MATRIX: ATOM 2: X= Y= Z= MULT= 6 ISPLIT= 8 ATOM 2:X= Y= Z= ATOM 2:X= Y= Z= ATOM 2:X= Y= Z= ATOM 2:X= Y= Z= ATOM 2:X= Y= Z= O 1 NPT= 781 R0= RMT= Z: 8.0 LOCAL ROT MATRIX: NUMBER OF SYMMETRY OPERATIONS Select Xc = PBE-GGA, R_Kmax = 7, L_max = 8, and nkpoint = 600 In the following examples you can find the percents that were used for strains. 14
15 ####################################### # R_ana_elast_lapw analyses Elastic # # constant # # C(2013) by Morteza Jamal # ####################################### ########################################## # R_ana_elastc_lapw analyses Elastic # # constant # # C(2013) by Morteza Jamal # # using case.outputeos # # VstVene # # which have been created by # # RHOM.job # ########################################## =============================================================== Order of fit: 2 C11 is: GPa, RMS: E-04 Order of fit: 3 C11 is: GPa, RMS: E-04 Order of fit: 4 C11 is: GPa, RMS: E-12 ****************************************** Polynomial fit for C11 done A RMS of E-04 was achieved using a polynome of degree : 2 At volume= bohr^3 C11 is: a.u or GPa ****************************************** Analyze done... Do you want a hardcopy? (y/n) *************************************** You can find data in ELC.output file. *************************************** ########################################## # R_ana_elastc_lapw analyses Elastic # # constant # # C(2013) by Morteza Jamal # # using case.outputeos # # VstVene # # which have been created by # # RHOM.job # ########################################## =============================================================== Order of fit: 2 C11+C12 is: GPa, RMS: E-04 Order of fit: 3 C11+C12 is: GPa, RMS: E-05 Order of fit: 4 C11+C12 is: GPa, RMS: E-12 ****************************************** 15
16 Polynomial fit for C11+C12 done A RMS of E-04 was achieved using a polynome of degree : 2 At volume= bohr^3 C11+C12 is: a.u or GPa ****************************************** Analyze done... Do you want a hardcopy? (y/n) *************************************** You can find data in ELC.output file. *************************************** ########################################## # R_ana_elastc_lapw analyses Elastic # # constant # # C(2013) by Morteza Jamal # # using case.outputeos # # VstVene # # which have been created by # # RHOM.job # ########################################## =============================================================== Order of fit: 2 C11+C33+2C13 is: GPa, RMS: E-03 Order of fit: 3 C11+C33+2C13 is: GPa, RMS: E-04 Order of fit: 4 C11+C33+2C13 is: GPa, RMS: E-12 ****************************************** Polynomial fit for C11+C33+2C13 done A RMS of E-03 was achieved using a polynome of degree : 2 At volume= bohr^3 C11+C33+2C13 is: a.u or GPa ****************************************** Analyze done... Do you want a hardcopy? (y/n) *************************************** You can find data in ELC.output file. *************************************** ########################################## # R_ana_elastc_lapw analyses Elastic # # constant # # C(2013) by Morteza Jamal # # using case.outputeos # # VstVene # # which have been created by # # RHOM.job # ##########################################
17 =============================================================== Order of fit: 2 C11+4C44+4C14 is: GPa, RMS: E-04 Order of fit: 3 C11+4C44+4C14 is: GPa, RMS: E-04 Order of fit: 4 C11+4C44+4C14 is: GPa, RMS: E-12 ****************************************** Polynomial fit for C11+4C44+4C14 done A RMS of E-04 was achieved using a polynome of degree : 2 At volume= bohr^3 C11+4C44+4C14 is: a.u or GPa ****************************************** Analyze done... Do you want a hardcopy? (y/n) *************************************** You can find data in ELC.output file. *************************************** ########################################## # R_ana_elastc_lapw analyses Elastic # # constant # # C(2013) by Morteza Jamal # # using case.outputeos # # VstVene # # which have been created by # # RHOM.job # ########################################## =============================================================== Order of fit: 2 C33 is: GPa, RMS: E-04 Order of fit: 3 C33 is: GPa, RMS: E-04 Order of fit: 4 C33 is: GPa, RMS: E-12 ****************************************** Polynomial fit for C33 done A RMS of E-04 was achieved using a polynome of degree : 2 At volume= bohr^3 C33 is: a.u or GPa ****************************************** Analyze done... Do you want a hardcopy? (y/n) *************************************** You can find data in ELC.output file. *************************************** 17
18 ########################################## # R_ana_elastc_lapw analyses Elastic # # constant # # C(2013) by Morteza Jamal # # using case.outputeos # # VstVene # # which have been created by # # RHOM.job # ########################################## =============================================================== Order of fit: 2 C44 is: GPa, RMS: E-04 Order of fit: 3 C44 is: GPa, RMS: E-04 Order of fit: 4 C44 is: GPa, RMS: E-12 ****************************************** Polynomial fit for C44 done A RMS of E-04 was achieved using a polynome of degree : 2 At volume= bohr^3 C44 is: a.u or GPa ****************************************** Analyze done... Do you want a hardcopy? (y/n) *************************************** You can find data in ELC.output file. *************************************** Printing final Elastic constant At voulme= bohr^3. ======================================================================= C11 = GPa C11+C12 = GPa C33 = GPa C44 = GPa C11+4C44+4C14 = GPa C15 = 0 GPa C11+C33+2C13 = GPa ======================================================================= LU decomposition successful Inverse Successful You can find Inverse Matrix in INVELC-matrix file Done ======================================================================= Atom name = Al Atomic Mass from Periodic table = (gr/mol) Atomic Mass from Periodic table = *10^(-23) (gr) Atom name = O Atomic Mass from Periodic table = (gr/mol) Atomic Mass from Periodic table = *10^(-23) (gr) Volume in unit of cm^3 = *10^(-24) (cm^3) Mass of Compound : *10^(-23) (gr) Density of Compound : (gr/cm^3) 18
19 ======================================================================= C11 = GPa C12 = GPa C13 = GPa C33 = GPa C44 = GPa C14 = GPa C15 = 0 GPa Prediction VOIGT Bulk modulus by using elastic constant values Prediction REUSS Bulk modulus by using elastic constant values Prediction HILL Bulk modulus by using elastic constant values = (GPa) = (GPa) = (GPa) Prediction VOIGT Shear modulus by using elastic constant values = (GPa) Prediction REUSS Shear modulus by using elastic constant values = (GPa) Prediction HILL Shear modulus by using elastic constant values = (GPa) Prediction VOIGT Young modulus by using elastic constant values = (GPa) Prediction REUSS Young modulus by using elastic constant values = (GPa) Prediction HILL Young modulus by using elastic constant values = (GPa) Prediction VOIGT Poisson's coefficient by using elastic constant values =.223 Prediction REUSS Poisson's coefficient by using elastic constant values =.226 Prediction HILL Poisson's coefficient by using elastic constant values =.224 ======================================================================= By using HILL data Transverse elastic wave velocity = (m/s) Longitudinal elastic wave velocity = (m/s) The average wave velocity = (m/s) Debye Temperature = (K) ======================================================================= Press enter key to continue... ################################################ # R_ana_elastorder_lapw checks the sensitivity # # of elastic constants to the order of fit # # by using ELCorder.fit file # # C(2013) by Morteza Jamal # # # ################################################ CHECK THE SENSITIVITY OF YOUR RESULT TO THE ORDER OF FIT Press enter key to continue... Order of fit for calculations were 4,4,4,4, 4, and 4 We select minimum value for ORDER OF FIT i.e. 4 Press enter key to continue... ######## ORDER OF FIT IS : 2, At volume = (bohr^3) ######## (c11) = (GPa) (c11+c12) = (GPa) (c33) = (GPa) (c44) = (GPa) (c11+c33+2c13) = (GPa) (c11+4c44+4c14)= (GPa) (c15)= 0 (GPa) 19
20 c11 = (GPa) c12 = (GPa) c13 = (GPa) c33 = (GPa) c14 = (GPa) c44 = (GPa) c15 = 0 (GPa) ======================================================================= Prediction VOIGT Bulk modulus by using elastic constant values = (GPa) Prediction REUSS Bulk modulus by using elastic constant values = (GPa) Prediction HILL Bulk modulus by using elastic constant values = (GPa) Prediction VOIGT Shear modulus by using elastic constant values = (GPa) Prediction REUSS Shear modulus by using elastic constant values = (GPa) Prediction HILL Shear modulus by using elastic constant values = (GPa) Prediction VOIGT Young modulus by using elastic constant values = (GPa) Prediction REUSS Young modulus by using elastic constant values = (GPa) Prediction HILL Young modulus by using elastic constant values = (GPa) Prediction VOIGT Poisson's coefficient by using elastic constant values =.223 Prediction REUSS Poisson's coefficient by using elastic constant values =.226 Prediction HILL Poisson's coefficient by using elastic constant values =.224 ======================================================================= ######## ORDER OF FIT IS : 3, At volume = (bohr^3) ######## (c11) = (GPa) (c11+c12) = (GPa) (c33) = (GPa) (c44) = (GPa) (c11+c33+2c13) = (GPa) (c11+4c44+4c14)= (GPa) (c15)= 0 (GPa) c11 = (GPa) c12 = (GPa) c13 = (GPa) c33 = (GPa) c14 = (GPa) c44 = (GPa) c15 = 0 (GPa) ======================================================================= Prediction VOIGT Bulk modulus by using elastic constant values = (GPa) Prediction REUSS Bulk modulus by using elastic constant values = (GPa) Prediction HILL Bulk modulus by using elastic constant values = (GPa) Prediction VOIGT Shear modulus by using elastic constant values = (GPa) Prediction REUSS Shear modulus by using elastic constant values = (GPa) Prediction HILL Shear modulus by using elastic constant values = (GPa) Prediction VOIGT Young modulus by using elastic constant values = (GPa) Prediction REUSS Young modulus by using elastic constant values = (GPa) Prediction HILL Young modulus by using elastic constant values = (GPa) Prediction VOIGT Poisson's coefficient by using elastic constant values =.223 Prediction REUSS Poisson's coefficient by using elastic constant values =.226 Prediction HILL Poisson's coefficient by using elastic constant values =
21 ======================================================================= ######## ORDER OF FIT IS : 4, At volume = (bohr^3) ######## (c11) = (GPa) (c11+c12) = (GPa) (c33) = (GPa) (c44) = (GPa) (c11+c33+2c13) = (GPa) (c11+4c44+4c14)= (GPa) (c15)= 0 (GPa) c11 = (GPa) c12 = (GPa) c13 = (GPa) c33 = (GPa) c14 = (GPa) c44 = (GPa) c15 = 0 (GPa) ======================================================================= Prediction VOIGT Bulk modulus by using elastic constant values = (GPa) Prediction REUSS Bulk modulus by using elastic constant values = (GPa) Prediction HILL Bulk modulus by using elastic constant values = (GPa) Prediction VOIGT Shear modulus by using elastic constant values = (GPa) Prediction REUSS Shear modulus by using elastic constant values = (GPa) Prediction HILL Shear modulus by using elastic constant values = (GPa) Prediction VOIGT Young modulus by using elastic constant values = (GPa) Prediction REUSS Young modulus by using elastic constant values = (GPa) Prediction HILL Young modulus by using elastic constant values = (GPa) Prediction VOIGT Poisson's coefficient by using elastic constant values =.188 Prediction REUSS Poisson's coefficient by using elastic constant values =.201 Prediction HILL Poisson's coefficient by using elastic constant values =.195 ======================================================================= You can find these data in the output-order file. c11 = (GPa) c12 = (GPa) c13 = (GPa) c33 = (GPa) c14 = -2.4 (GPa) c44 = (GPa) c15 = 0.0 (GPa) 21
22 Al2O3(unrelax) Al2O3 (relax) Exp 3 Method FPLAPW FPLAPW Exchange PBE PBE C C C C C C C C66= (C11-C12)/2 22
23 5 Installation of the Rhom-elastic package The Rhom-elastic package comes as a compressed tar file namely Rhom-elastic.tar.gz. To install the package firstly copy the file to a directory of your choice. Now, uncompress and expand it as: tar zxvf Rhom-elastic.tar.gz cd Rhom-elastic Run buildrirelast_lapw This program helps you to create the "Makefile" and then compile Rhom-elastic. By default, the Makefile expects the lapack_lapw and blas_lapw to be in the location../src_lib. This should be changed to the correct location by modifying the FOPT parameter as shown below. This Program helps you to define Fortran compiler, Fortran options, and Library options if you have installed WIEN2k. As you can see here this program defines Fortran compiler, Fortran options, and Library options as automatically. Otherwise you can define compiler and linker options as well as the path of mkl library depending on the your selected system. /home/mylib/mkl/lib/em64t is the path of my mkl library. To make Makefile by the lapack_lapw and blas_lapw libraries in the location../src_lib and gfortran use the following options: Fortran compiler: gfortran Fortran options: -ffree-form Library options (Lapack and BLAS): $(FOPT) L/home/physicsprogram/SRC_lib lpthread static llapack_lapw lblas_lapw the location../src_lib should be changed to the correct location by modifying the FOPT parameter as shown above. PS: To install with -ffree-form, you should compile the lapack_lapw and blas_lapw libraries with -ffree-form options. Otherwise it might was caused error. 23
24 If you view the OPTIONS file of the WIEN2k package you can use the FOPT, LDFLAGS, and R_LIBS of it for compiling. After defining the Fortran compiler, Fortran options, and Library options press Enter key. 24
25 25
26 The Environment Variable ELASTR_PATH is then defined and added to the end of the.bashrc file. Thus you will be able to call Rhom-elastic s programs for any location. 26
27 If you view the.bashrc file you can see Now, logout from your Linux system and then login. 27
28 6 References [1] R. Stadler, W. Wolf, R. Podloucky, G. Kresse, J. Furthmller, J. Hafner, Phys. Rev. B 54 (1996) [2] B. Z. Yanchitsky, A. N. Timoshevskii, Determination of the space group and unit cell for a periodic solid, Comp. Phys. Comm. 139 (2001) [3] C. J. Smithells, E. A. Brandes, F. R. Institute., Smithells metals reference book, Vol. 8, Butterworth-Heinemann,
A Package for calculating elastic tensors of tetragonal Phases by using second-order derivative with Wien2k Package
IR ELAST + WIEN2k A Package for calculating elastic tensors of tetragonal Phases by using second-order derivative with Wien2k Package User s guide, Tetra-elastic_13.2 (Release 27.08.2013) Morteza Jamal
More informationA Package for calculating elastic tensors of cubic Phases by using second-order derivative with WIEN2k Package
IR E L A S T + W I E N 2k A Package for calculating elastic tensors of cubic Phases by using second-order derivative with WIEN2k Package User s guide, Cubic-elastic_13.2 (Release 27.08.2013) Morteza Jamal
More informationA Package for calculating elastic tensors of hexagonal Phases by using second-order derivative with Wien2k Package
IR E L A S T + W I E N 2k A Package for calculating elastic tensors of hexagonal Phases by using second-order derivative with Wien2k Package User s guide, Hex-elastic_13.2 (Release 27.08.2013) Morteza
More informationThis package performs a convenient 2-Dimensional structure optimization ( Volume and c/a ) for hexagonal or tetragonal spacegroups.
Package 2Doptimize -------------------------- This package performs a convenient 2-Dimensional structure optimization ( Volume and c/a ) for hexagonal or tetragonal spacegroups. If you want to use this
More informationCOMPUTATIONAL TOOL. Fig. 4.1 Opening screen of w2web
CHAPTER -4 COMPUTATIONAL TOOL Ph.D. Thesis: J. Maibam CHAPTER: 4 4.1 The WIEN2k code In this work, all the calculations presented are performed using the WIEN2k software package (Blaha et al., 2001). The
More informationExercises: In the following you find some suggestions for exercises, which teach you various tasks one may perform with WIEN2k.
Exercises: In the following you find some suggestions for exercises, which teach you various tasks one may perform with WIEN2k. New WIEN2k users should start with the first basic exercises (1-5), covering:
More informationColloque National sur les Techniques de Modélisation et de Simulation en Science des Matériaux, Sidi Bel-Abbès Novembre 2009
Colloque National sur les Techniques de Modélisation et de Simulation en Science des Matériaux, Sidi Bel-Abbès. 23-24 Novembre 2009 Elastic, electronic and optical properties of SiGe 2N 4 under pressure
More informationComputational Material Science Part II-1: introduction. Horng-Tay Jeng ( 鄭弘泰 ) Institute of Physics, Academia Sinica
Computational Material Science Part II-1: introduction Horng-Tay Jeng ( 鄭弘泰 ) Institute of Physics, Academia Sinica Outline Introduction of Computational Material Science (CMS) Density Functional Theory
More informationGaAs -- MLWF. Special thanks to Elias Assmann (TU Graz) for the generous help in preparation of this tutorial
GaAs -- MLWF + + Special thanks to Elias Assmann (TU Graz) for the generous help in preparation of this tutorial YouTube video: https://youtu.be/r4c1yhdh3ge 1. Wien2k SCF Create a tutorial directory, e.g.
More informationEOS-FIT V6.0 R.J. ANGEL
EOS-FIT V6. R.J. AGEL Crystallography Laboratory, Dept. Geological Sciences, Virginia Tech, Blacksburg, VA46, USA http://www.geol.vt.edu/profs/rja/ ITRODUCTIO EosFit started as a program to fit equations
More informationAnalysis of an Electric-Field Gradient (EFG): the EFG-switch in LAPW2
Analysis of an Electric-Field Gradient (EFG): the EFG-switch in LAPW2 Katrin Koch Stefaan Cottenier August 10, 2011 0.1 In brief: the EFG and how it is obtained in LAPW The EFG is a traceless symmetric
More informationAs an example we consider the stacking and analysis of a 2-ply symmetric laminate. First we clear the Matlab space and close figures.
Program Lam 1 Introduction The collection of Matlab command and function files in the package lam allows the stacking and analysis of a laminate. In fact only a representative piece of a laminate is considered,
More informationSpin transport in Magnetic Tunnel Junctions
Spin transport in Magnetic Tunnel Junctions Tutorial on spin transport in Fe-MgO-Fe Version 2015.2 Spin transport in Magnetic Tunnel Junctions: Tutorial on spin transport in Fe-MgO-Fe Version 2015.2 Copyright
More informationExercises: In the following you find some suggestions for exercises, which teach you various tasks one may perform with WIEN2k.
Exercises: In the following you find some suggestions for exercises, which teach you various tasks one may perform with WIEN2k. Please note, that often calculational parameters are set to minimal cpu-time
More informationLecture 4 Implementing material models: using usermat.f. Implementing User-Programmable Features (UPFs) in ANSYS ANSYS, Inc.
Lecture 4 Implementing material models: using usermat.f Implementing User-Programmable Features (UPFs) in ANSYS 1 Lecture overview What is usermat.f used for? Stress, strain and material Jacobian matrix
More informationExample: H 2 O (the car file)
Example: H 2 O (the car file) As a practical example of DFT methods we calculate the energy and electronic properties of the water molecule. In order to carry out the DFT calculation you will need a set
More informationA two-dimensional FE truss program
A two-dimensional FE truss program 4M020: Design Tools Eindhoven University of Technology Introduction The Matlab program fem2d allows to model and analyze two-dimensional truss structures, where trusses
More informationOPENATOM for GW calculations
OPENATOM for GW calculations by OPENATOM developers 1 Introduction The GW method is one of the most accurate ab initio methods for the prediction of electronic band structures. Despite its power, the GW
More informationMATERIAL MECHANICS, SE2126 COMPUTER LAB 4 MICRO MECHANICS. E E v E E E E E v E E + + = m f f. f f
MATRIAL MCHANICS, S226 COMPUTR LAB 4 MICRO MCHANICS 2 2 2 f m f f m T m f m f f m v v + + = + PART A SPHRICAL PARTICL INCLUSION Consider a solid granular material, a so called particle composite, shown
More information1.1 Contribution to the total energy For the LDA+U and orbital polarization methods a correction to the total energy appears E corr = E orb T r(v orb
Orbital package in WIEN P. Novak Institute of Physics, Prague, Czech Republic, novakp@fzu.cz April 2002 1 Description of SRC orb package Orbital package calculates the orbitally dependent potentials V
More informationPROMAL2012 SOFTWARE PACKAGE A USER GUIDE
PROMAL2012 SOFTWARE PACKAGE A USER GUIDE 1. This manual is only for VISTA, WINDOWS 7 and WINDOWS 8 users. The PROMAL2012 software and manual are available at http://www.eng.usf.edu/~kaw/promal2012/ 2.
More informationStrain-related Tensorial Properties: Elasticity, Piezoelectricity and Photoelasticity
Strain-related Tensorial Properties: Elasticity, Piezoelectricity and Photoelasticity Torino, Italy, September 4-9, 2016 Alessandro Erba Dipartimento di Chimica, Università di Torino (Italy) alessandro.erba@unito.it
More informationMaterials that you may find helpful when working through this exercise
Detailed steps illustrating how to use VASP on the Suns in Fitz 177 For use in lab: 11/10/2009 (Original file by Dr. Rachel Getman, 11/18/2007. Editted for use by Dorrell McCalman 11/09/2009.) Note on
More informationPredicting the Structure of Solids by DFT
Questions? Hudson Hall 235 or Hudson Hall 1111 Predicting the Structure of Solids by DFT Hands-On Instructions Contents 1 Cohesive Energy for Bulk Phases of Si 11 Setting up the Structures 12 Structure-Dependent
More informationCrystalline and Magnetic Anisotropy of the 3d Transition-Metal Monoxides
Crystalline and of the 3d Transition-Metal Monoxides Institut für Festkörpertheorie und -optik Friedrich-Schiller-Universität Max-Wien-Platz 1 07743 Jena 2012-03-23 Introduction Crystalline Anisotropy
More informationconnect/setup of w2web environment
connect/setup of w2web environment Connect to pleiades.bc.edu using NoMachine as indicated in the instructions and with the username/pw you got during registration. open a terminal and connect to your
More informationMcMAT 2007 Micromechanics of Materials Austin, Texas, June 3 7, 2007
McMAT 2007 Micromechanics of Materials Austin, Texas, June 3 7, 2007 RANDOM POLYCRYSTALS OF GRAINS WITH CRACKS: MODEL OF ELASTIC BEHAVIOR FOR FRACTURED SYSTEMS James G. Berryman Earth Sciences Division
More informationCHAPTER 3 WIEN2k. Chapter 3 : WIEN2k 50
CHAPTER 3 WIEN2k WIEN2k is one of the fastest and reliable simulation codes among computational methods. All the computational work presented on lanthanide intermetallic compounds has been performed by
More informationPWSCF First examples
PWSCF First examples (much more in espresso 3.1.1/examples directory!) Guido Fratesi (Università di Milano) Urbana, August 2006 A pw.x input file &CONTROL / &SYSTEM / &ELECTRONS title calculation restart_mode
More informationThe Augmented Spherical Wave Method
Introduction Institut für Physik, Universität Augsburg Electronic Structure in a Nutshell Outline 1 Fundamentals Generations 2 Outline 1 Fundamentals Generations 2 Outline Fundamentals Generations 1 Fundamentals
More informationSpin-orbit coupling in Wien2k
Spin-orbit coupling in Wienk Robert Laskowski rolask@ihpc.a-star.edu.sg Institute of High Performance Computing Singapore Dirac Hamiltonian Quantum mechanical description of electrons, consistent with
More informationTable of Contents. Table of Contents Spin-orbit splitting of semiconductor band structures
Table of Contents Table of Contents Spin-orbit splitting of semiconductor band structures Relavistic effects in Kohn-Sham DFT Silicon band splitting with ATK-DFT LSDA initial guess for the ground state
More informationIntroduction to Condensed Matter Physics
Introduction to Condensed Matter Physics Elasticity M.P. Vaughan Overview Overview of elasticity Classical description of elasticity Speed of sound Strain Stress Young s modulus Shear modulus Poisson ratio
More informationDMDW: A set of tools to calculate Debye-Waller factors and other related quantities using dynamical matrices.
DMDW: A set of tools to calculate Debye-Waller factors and other related quantities using dynamical matrices. DMDW is a set of tools developed to calculate Debye-Waller (DW) factors and other related quantities
More informationTwo-dimensional Phosphorus Carbide as Promising Anode Materials for Lithium-ion Batteries
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is The Royal Society of Chemistry 2018 Supplementary Material for Two-dimensional Phosphorus Carbide as Promising
More informationA DFT Study on Electronic Structures and Elastic Properties of AgX (X=C, N) in Rock Salt Structure
Invertis Journal of Jameson Science Maibam, and Technology, Kh. Kabita, Vol. B. Indrajit 7, No. 2, Sharma, 2014. R.K. ; pp. Thapa 114-118 and R.K. Brojen Singh A DFT Study on Electronic Structures and
More informationarxiv:physics/ v2 [physics.atom-ph] 31 May 2004
arxiv:physics/0405136v2 [physics.atom-ph] 31 May 2004 Pure spin angular momentum coefficients for non scalar one particle operators in jj coupling G. Gaigalas a and S. Fritzsche b a Institute of Theoretical
More informationEBIS-PIC 2D. 2D EBIS Simulation Code. Version 0.1. Copyright ( ) January FAR-TECH, Inc Science Center Dr., Ste 150. San Diego CA 92121
EBIS-PIC 2D 2D EBIS Simulation Code Version 0.1 Copyright ( ) January 2017 by 10350 Science Center Dr., Ste 150 San Diego CA 92121 Phone 858-455-6655 Email support@far-tech.com URL http://www.far-tech.com
More information16.21 Techniques of Structural Analysis and Design Spring 2003 Unit #5 - Constitutive Equations
6.2 Techniques of Structural Analysis and Design Spring 2003 Unit #5 - Constitutive quations Constitutive quations For elastic materials: If the relation is linear: Û σ ij = σ ij (ɛ) = ρ () ɛ ij σ ij =
More informationMATERIAL ELASTIC ANISOTROPIC command
MATERIAL ELASTIC ANISOTROPIC command.. Synopsis The MATERIAL ELASTIC ANISOTROPIC command is used to specify the parameters associated with an anisotropic linear elastic material idealization. Syntax The
More informationMustafa Uludogan 1, Tahir Cagin, William A. Goddard, III Materials and Process Simulation Center, Caltech, Pasadena, CA 91125, U.S.A.
Ab Initio Studies On Phase Behavior of Barium Titanate Mustafa Uludogan 1, Tahir Cagin, William A. Goddard, III Materials and Process Simulation Center, Caltech, Pasadena, CA 91125, U.S.A. 1 Physics Department,
More informationDynamics of the Atmosphere GEMPAK Lab 3. 3) In-class exercise about geostrophic balance in the real atmosphere.
Dynamics of the Atmosphere GEMPAK Lab 3 Goals of this lab: 1) Learn about Linux scripts. 2) Learn how to combine levels in GEMPAK functions. 3) In-class exercise about geostrophic balance in the real atmosphere.
More informationAb Initio Study of Electronic, Structural, Thermal and Mechanical Characterization of Cadmium Chalcogenides 65
Ab Initio Study of Electronic, Structural, Thermal and Mechanical Characterization of Cadmium Chalcogenides 65 Devi Prasadh P.S. 1, a, B.K. Sarkar 2, b 1 Department of Physics, Dr. Mahalingam College of
More informationELECTRONIC AND MAGNETIC PROPERTIES OF BERKELIUM MONONITRIDE BKN: A FIRST- PRINCIPLES STUDY
ELECTRONIC AND MAGNETIC PROPERTIES OF BERKELIUM MONONITRIDE BKN: A FIRST- PRINCIPLES STUDY Gitanjali Pagare Department of Physics, Sarojini Naidu Govt. Girls P. G. Auto. College, Bhopal ( India) ABSTRACT
More informationWannier functions. Macroscopic polarization (Berry phase) and related properties. Effective band structure of alloys
Wannier functions Macroscopic polarization (Berry phase) and related properties Effective band structure of alloys P.Blaha (from Oleg Rubel, McMaster Univ, Canada) Wannier functions + + Wannier90: A Tool
More informationModule 2: Quantum Espresso Walkthrough
Module 2: Quantum Espresso Walkthrough Energy and Geometry Optimization of the H 2 Molecule We will be using the PWSCF code for quantum mechanical calculations of extended systems. The PWSCF program is
More informationCalculating Vibrational Spectra from Molecular Dynamics
Calculating Vibrational Spectra from Molecular Dynamics A Simulating a Trajectory with Wannier Centers To calculate IR spectra from Molecular Dynamics, it is necessary to have dipole information for the
More informationSupporting Information
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry C. This journal is The Royal Society of Chemistry 2016 Supporting Information Metal-Free Half-Metallicity in a High Energy Phase
More informationSurface stress and relaxation in metals
J. Phys.: Condens. Matter 12 (2000) 5541 5550. Printed in the UK PII: S0953-8984(00)11386-4 Surface stress and relaxation in metals P M Marcus, Xianghong Qian and Wolfgang Hübner IBM Research Center, Yorktown
More informationSIMULATION OF FLUID-STRUCTURAL INTERACTION
SIMULATION OF FLUID-STRUCTURAL INTERACTION USING OPENFOAM Hua-Dong Yao Department of Applied Mechanics, Chalmers University of Technology Sep 15, 2014 Hua-Dong Yao Simulation of FSI using OpenFOAM Sep
More informationOn Dynamic and Elastic Stability of Lanthanum Carbide
Journal of Physics: Conference Series On Dynamic and Elastic Stability of Lanthanum Carbide To cite this article: B D Sahoo et al 212 J. Phys.: Conf. Ser. 377 1287 Recent citations - Theoretical prediction
More informationAb-initio Calculations of Structural, Electronic, Elastic and Mechanical Properties of REIn 3 and RETl 3 (RE= Yb & Lu) Intermetallic Compounds
Abstract Ab-initio Calculations of Structural, Electronic, Elastic and Mechanical Properties of REIn 3 and RETl 3 (RE= Yb & Lu) Intermetallic Compounds Jisha Annie Abraham 1, 2, Gitanjali Pagare 1,* and
More informationTable of Contents. Table of Contents Initialize from a converged state. Introduction Examples
Table of Contents Table of Contents Initialize from a converged state Introduction Examples Water molecule example Looping over parameters Stepping up in bias Special example: anti-parallel spin in MTJs
More informationTable of Contents. Table of Contents Electronic structure of NiO with DFT+U. Introduction The electronic structure of NiO calculated with DFT
Table of Contents Table of Contents Electronic structure of NiO with DFT+U Introduction The electronic structure of NiO calculated with DFT Setting up the calculation Performing the calculation Analysing
More informationEAM. ReaxFF. PROBLEM B Fracture of a single crystal of silicon
PROBLEM B Fracture of a single crystal of silicon This problem set utilizes a new simulation method based on Computational Materials Design Facility (CMDF) to model fracture in a brittle material, silicon.
More informationFINITE ELEMENT ANALYSIS OF ARKANSAS TEST SERIES PILE #2 USING OPENSEES (WITH LPILE COMPARISON)
FINITE ELEMENT ANALYSIS OF ARKANSAS TEST SERIES PILE #2 USING OPENSEES (WITH LPILE COMPARISON) Ahmed Elgamal and Jinchi Lu October 07 Introduction In this study, we conduct a finite element simulation
More informationComputing IR / Raman / VCD / ROA Spectra with CP2k and TRAVIS
Computing IR / Raman / VCD / ROA Spectra with CP2k and TRAVIS Martin Brehm Martin Luther Universität Halle Wittenberg Martin_Brehm@gmx.de 0. Introduction In this exercise, we will compute the full set
More informationMODULE 2: QUANTUM MECHANICS. Practice: Quantum ESPRESSO
MODULE 2: QUANTUM MECHANICS Practice: Quantum ESPRESSO I. What is Quantum ESPRESSO? 2 DFT software PW-DFT, PP, US-PP, PAW http://www.quantum-espresso.org FREE PW-DFT, PP, PAW http://www.abinit.org FREE
More informationChapter: 22. Visualization: Making INPUT File and Processing of Output Results
Chapter: 22 Visualization: Making INPUT File and Processing of Output Results Keywords: visualization, input and output structure, molecular orbital, electron density. In the previous chapters, we have
More informationSpeed-up of ATK compared to
What s new @ Speed-up of ATK 2008.10 compared to 2008.02 System Speed-up Memory reduction Azafulleroid (molecule, 97 atoms) 1.1 15% 6x6x6 MgO (bulk, 432 atoms, Gamma point) 3.5 38% 6x6x6 MgO (k-point sampling
More informationScientific Programming in C XIII. Shell programming
Scientific Programming in C XIII. Shell programming Susi Lehtola 11 December 2012 Introduction Often in scientific computing one needs to do simple tasks related to renaming of files file conversions unit
More informationCHAPTER: 8. ELECTRONIC STRUCTURE AND ELASTIC PROPERTIES OF CrC AND CrN. 8.1 Introduction. Ph.D. Thesis: J. Maibam
CHAPTER -8 CHAPTER: 8 ELECTRONIC STRUCTURE AND ELASTIC PROPERTIES OF CrC AND CrN 8.1 Introduction In this chapter, we have selected CrC and CrN from group VIB transition metal carbides and nitrides for
More informationElasticity Constants of Clay Minerals Using Molecular Mechanics Simulations
Elasticity Constants of Clay Minerals Using Molecular Mechanics Simulations Jin-ming Xu, Cheng-liang Wu and Da-yong Huang Abstract The purpose of this paper is to obtain the elasticity constants (including
More informationN = Shear stress / Shear strain
UNIT - I 1. What is meant by factor of safety? [A/M-15] It is the ratio between ultimate stress to the working stress. Factor of safety = Ultimate stress Permissible stress 2. Define Resilience. [A/M-15]
More informationStatus report on the showering of Alpgen events with Herwig++ for ATLAS
Status report on the showering of Alpgen events with Herwig++ for ATLAS University of Oslo December 202 Introduction We want to set up and validate the processing of Alpgen events with Herwig++ in ATLAS,
More informationMinnesota Functional Module Version 1.8
1 Minnesota Functional Module Version 1.8 Subroutines for evaluating the M05, M05-2X, M06-L, M06-HF, M06, M06-2X, M08-HX, M08-SO, M11, M11-L, MN12-L, SOGGA, SOGGA11, SOGGA11-X, N12, N12-SX Functionals
More informationModelling Anisotropic, Hyperelastic Materials in ABAQUS
Modelling Anisotropic, Hyperelastic Materials in ABAQUS Salvatore Federico and Walter Herzog Human Performance Laboratory, Faculty of Kinesiology, The University of Calgary 2500 University Drive NW, Calgary,
More informationA Molecular Modeling Approach to Predicting Thermo-Mechanical Properties of Thermosetting Polymers
A Molecular Modeling Approach to Predicting Thermo-Mechanical Properties of Thermosetting Polymers Natalia Shenogina, Wright State University Mesfin Tsige, University of Akron Soumya Patnaik, AFRL Sharmila
More informationDue: since the calculation takes longer than before, we ll make it due on 02/05/2016, Friday
Homework 3 Due: since the calculation takes longer than before, we ll make it due on 02/05/2016, Friday Email to: jqian@caltech.edu Introduction In this assignment, you will be using a commercial periodic
More informationBoris Mantisi. Contents. Context 2. How to install APoGe 3. How APoGe works 4. Input File 5. Crystal File 8. How to use APoGe 10
Boris Mantisi Contents Context 2 How to install APoGe 3 How APoGe works 4 Input File 5 Crystal File 8 How to use APoGe 10 Context Polycrystalline structure plays an important role in the macroscopic properties
More informationLab 3: Handout Quantum-ESPRESSO: a first principles code, part 2.
1 Lab 3: Handout Quantum-ESPRESSO: a first principles code, part 2. In this lab, we will be using Quantum-ESPRESSO as our first-principles code again. In problem 1, we will compare energy between allotropes
More informationProject. First Saved Monday, June 27, 2011 Last Saved Wednesday, June 29, 2011 Product Version 13.0 Release
Project First Saved Monday, June 27, 2011 Last Saved Wednesday, June 29, 2011 Product Version 13.0 Release Contents Units Model (A4, B4) o Geometry! Solid Bodies! Parts! Parts! Body Groups! Parts! Parts
More informationResidual Stress analysis
Residual Stress analysis Informations: strains Macro elastic strain tensor (I kind) Crystal anisotropic strains (II kind) Fe Cu C Macro and micro stresses Applied macro stresses Residual Stress/Strain
More informationQUANTUM CHEMISTRY PROJECT 3: PARTS B AND C
Chemistry 460 Fall 2017 Dr. Jean M. Standard November 6, 2017 QUANTUM CHEMISTRY PROJECT 3: PARTS B AND C PART B: POTENTIAL CURVE, SPECTROSCOPIC CONSTANTS, AND DISSOCIATION ENERGY OF DIATOMIC HYDROGEN (20
More informationSupporting Information. Potential semiconducting and superconducting metastable Si 3 C. structures under pressure
Supporting Information Potential semiconducting and superconducting metastable Si 3 C structures under pressure Guoying Gao 1,3,* Xiaowei Liang, 1 Neil W. Ashcroft 2 and Roald Hoffmann 3,* 1 State Key
More informationSpacegroup P4 2 /mnm. Structure given by: spacegroup lattice parameter positions of atoms (basis)
Spacegroup P4 2 /mnm Structure given by: spacegroup lattice parameter positions of atoms (basis) Rutile TiO 2 : P4 2 /mnm (136) a=8.68, c=5.59 bohr Ti: (0,0,0) O: (0.304,0.304,0) Specify: Structure generator
More informationIAP 2006: From nano to macro: Introduction to atomistic modeling techniques and application in a case study of modeling fracture of copper (1.
IAP 2006: From nano to macro: Introduction to atomistic modeling techniques and application in a case study of modeling fracture of copper (1.978 PDF) http://web.mit.edu/mbuehler/www/teaching/iap2006/intro.htm
More informationStructural and thermal properties of Fe 2 (Zr,Nb) system in C15, C14 and C36 Laves phases: First-Principles study
Structural and thermal properties of Fe 2 (Zr,Nb) system in, and Laves phases: First-Principles study L. RABAHI 1, D. BRADAI 2 and A. KELLOU 3 1 Centre National de Recherche en Soudage et Contrôle, Route
More informationIntroduction to Hartree-Fock calculations in Spartan
EE5 in 2008 Hannes Jónsson Introduction to Hartree-Fock calculations in Spartan In this exercise, you will get to use state of the art software for carrying out calculations of wavefunctions for molecues,
More informationComputational Workshop: Running R-matrix Codes for Atomic Processes
Computational Workshop: Running R-matrix Codes for Atomic Processes - Prof. Sultana N. Nahar Astronomy, Ohio State U, Columbus, Ohio, USA Emails, Web: nahar.1@osu.edu http://www.astronomy.ohio-state.edu/
More informationTransition states and reaction paths
Transition states and reaction paths Lab 4 Theoretical background Transition state A transition structure is the molecular configuration that separates reactants and products. In a system with a single
More informationMECHANICS OF MATERIALS. EQUATIONS AND THEOREMS
1 MECHANICS OF MATERIALS. EQUATIONS AND THEOREMS Version 2011-01-14 Stress tensor Definition of traction vector (1) Cauchy theorem (2) Equilibrium (3) Invariants (4) (5) (6) or, written in terms of principal
More informationUser Guide for Hermir version 0.9: Toolbox for Synthesis of Multivariate Stationary Gaussian and non-gaussian Series
User Guide for Hermir version 0.9: Toolbox for Synthesis of Multivariate Stationary Gaussian and non-gaussian Series Hannes Helgason, Vladas Pipiras, and Patrice Abry June 2, 2011 Contents 1 Organization
More informationThe quasi-harmonic approximation (QHA)
The quasi-harmonic approximation (QHA) M. Palumbo 19/01/2017 Trieste, Italy Limitations of the harmonic approximation E tot(r I, u I )=E tot(r I )+ I,α E tot u u Iα + 1 2 E tot Iα 2 I,α u u Iα u Iα u Jβ
More information1 Slope Stability for a Cohesive and Frictional Soil
Slope Stability for a Cohesive and Frictional Soil 1-1 1 Slope Stability for a Cohesive and Frictional Soil 1.1 Problem Statement A common problem encountered in engineering soil mechanics is the stability
More informationDISCRETE RANDOM VARIABLES EXCEL LAB #3
DISCRETE RANDOM VARIABLES EXCEL LAB #3 ECON/BUSN 180: Quantitative Methods for Economics and Business Department of Economics and Business Lake Forest College Lake Forest, IL 60045 Copyright, 2011 Overview
More informationMOPAC Manual. ADF Modeling Suite
MOPAC Manual ADF Modeling Suite 2018 www.scm.com Sep 18, 2018 CONTENTS 1 Introduction 1 2 Input keywords 3 3 References 5 i ii CHAPTER ONE INTRODUCTION MOPAC [1 (page 5)] is a general-purpose semiempirical
More informationUNIVERSITY OF SASKATCHEWAN ME MECHANICS OF MATERIALS I FINAL EXAM DECEMBER 13, 2008 Professor A. Dolovich
UNIVERSITY OF SASKATCHEWAN ME 313.3 MECHANICS OF MATERIALS I FINAL EXAM DECEMBER 13, 2008 Professor A. Dolovich A CLOSED BOOK EXAMINATION TIME: 3 HOURS For Marker s Use Only LAST NAME (printed): FIRST
More informationSupplementary Materials
Supplementary Materials Atomistic Origin of Brittle Failure of Boron Carbide from Large Scale Reactive Dynamics Simulations; Suggestions toward Improved Ductility Qi An and William A. Goddard III * Materials
More informationEquilibrium state of a metal slab and surface stress
PHYSICAL REVIEW B VOLUME 60, NUMBER 23 15 DECEMBER 1999-I Equilibrium state of a metal slab and surface stress P. M. Marcus IBM Research Division, T. J. Watson Research Center, Yorktown Heights, New York
More informationRelativistic effects & magnetism. in WIEN2k
4 th WIENk Workshop Vienna 7 Relativistic effects & magnetism in WIENk Xavier Rocquefelte Institut des Sciences Chimiques de Rennes (UMR 66) Université de Rennes, FRANCE 4 th WIENk Workshop Vienna 7 Talk
More informationSolid State Theory Physics 545
olid tate Theory hysics 545 Mechanical properties of materials. Basics. tress and strain. Basic definitions. Normal and hear stresses. Elastic constants. tress tensor. Young modulus. rystal symmetry and
More informationand strong interlayer quantum confinement
Supporting Information GeP3: A small indirect band gap 2D crystal with high carrier mobility and strong interlayer quantum confinement Yu Jing 1,3, Yandong Ma 1, Yafei Li 2, *, Thomas Heine 1,3 * 1 Wilhelm-Ostwald-Institute
More informationPhysics 584 Computational Methods
Physics 584 Computational Methods Introduction to Matlab and Numerical Solutions to Ordinary Differential Equations Ryan Ogliore April 18 th, 2016 Lecture Outline Introduction to Matlab Numerical Solutions
More informationQuantum ESPRESSO. PWSCF: first steps
Quantum ESPRESSO PWSCF: first steps What can I learn in this tutorial? What can I learn in this tutorial? How to run PWscf (pw.x) in self-consistent mode for Silicon How to get the band structure of Silicon
More informationFig. 1. Circular fiber and interphase between the fiber and the matrix.
Finite element unit cell model based on ABAQUS for fiber reinforced composites Tian Tang Composites Manufacturing & Simulation Center, Purdue University West Lafayette, IN 47906 1. Problem Statement In
More informationMolecular Dynamics, Stochastic simulations, and Monte Carlo
UMEÅ UNIVERSITY September 11, 2018 Department of Physics Modeling and Simulation, 7.5hp Molecular Dynamics, Stochastic simulations, and Monte Carlo Peter Olsson Miscellanous comments The following instructions
More informationTVID: Three-loop Vacuum Integrals from Dispersion relations
TVID: Three-loop Vacuum Integrals from Dispersion relations Stefan Bauberger, Ayres Freitas Hochschule für Philosophie, Philosophische Fakultät S.J., Kaulbachstr. 3, 80539 München, Germany Pittsburgh Particle-physics
More informationFast Simulation of Higgs Recoil Mass
Fast Simulation of Higgs Recoil Mass YANG Ying 1 2 RUAN Manqi 2 JIN Shan 2 1 Central China Normal University 2 Institute of High Energy Physics Chinese Academy of Sciences 1 Outline From ILD to CEPC detector
More informationby investigation of elastic constants
Journal of Physics: Conference Series PAPER OPEN ACCESS Comparison between layering NbSe 2 and rod characteristic of MgB 2 by investigation of elastic constants To cite this article: Asiye Shokri et al
More information