This package performs a convenient 2-Dimensional structure optimization ( Volume and c/a ) for hexagonal or tetragonal spacegroups.
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1 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 package please follow the following steps. FOR USING Make struct file. 2- Do initialization ( run "instgen_lapw" and "init_lapw" in Terminal). 3- If you want to do Spin-Orbit calculations run "initso_lapw" in Terminal. 4- If you want to do LDA+U calculations make "case.inso" and case.inorb files in your present work directory. 5- call set2d_lapw in Terminal ( type set2d_lapw ). This program generates a set of structures ( by using setup2d program ) and a job-file ( 2Doptimize.job ). Moreover you have to specify the order of fit ( stored in.fordfitcoa file ) and the changes in volume and c/a.
2 In the following examples, we select order of fit 5 And default parameters for volume and c/a changes
3 Note 1: number of volume and c/a changes must be equal or greater than order of fit. 6- Edit 2Doptimize.job file with 'gedit' or ' vi ' in Terminal Environment and modify it according to your needs. For example, use "runsp_lapw" for Spin-Polarized (SP) system or even "min_lapw" or specify different convergence parameters. # if you have a previous optimize-run: # cp $i.clmsum Be.clmsum # cp $i.clmup Be.clmup # cp $i.clmdn Be.clmdn # if you want to start with dstart: # x dstart # -c # x dstart -up # -c # x dstart -dn # -c # recommended option: use charge extrapolation clmextrapol_lapw if (-e Be.clmup && \! -z Be.clmup ) then clmextrapol_lapw -up clmextrapol_lapw -dn endif run_lapw -ec # -in1new 3 -in1orig # runsp_lapw -ec # min -I -j "run_lapw -I -fc 1.0 -i 40 " set stat = $status if ($stat) then echo "ERROR status in" $i exit 1 endif save_lapw ${i}$savename # save_lapw -f -d XXX $i (Convert to #clmextrapol_lapw for SP case) For SO and LDA+U calculations It s better do it step by step i.e: runsp_lapw -ec in1new 2 save scfsimple runsp_lapw ec so save scfso runsp_lapw ec so -orb 7- Now run 2Doptimize.job in Terminal Environment ( type 2Doptimize.job ). It will take time. Note 2: When you want to rerun 2Doptimize.job with modifications in (RKmax, k-mesh, XC-potentials ) choose "answscf=no" in 2Doptimize.job file and a new "savename" (eg. "_use_pbe_rk8").
4 #!/bin/csh -f # #Modify this script according to your needs unalias rm # # 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= # 8- Run "ana2d_lapw" in Terminal Environment ( type ana2d_lapw ) and answer to questions. "ana2d_lapw will analyze the results. It uses a set of case.vconst* files (produced by 2Doptimize.job and stored also in subdirectory Vconst) and the numbvcoa file. You can see results for - energy vs. c/a for each volume, - energy vs. volume (with optimized c/a) and - c/a vs. volume. Optionally you can specify more cases by rerunning set2d lapw. Specify also your old volume and c/a points again (or leave them out on purpose in case they were very bad eg. very far from the minimum). The old results will then be taken automatically into account without recalculation ( unless you modify 2Doptimize.job i.e: set answscf=no ). At the end, you can see the results for lattice parameters, bulk modules,... Moreover the results of Volume-optimized, bulk modules,... save in "case.outputeos" file. Suppose you would like to change order of fit and check the sensitivity of the results with the fitting. Edit.fordfitcoa file with 'gedit' or ' vi ' in Terminal Environment and type in it order of fit and then save it and then rerun "ana2d_lapw" ( don t forget to attention to note 1 ). EXAMPLE Calculation 2-Dimensional of Equation Of State for hexagonal Mg Mg H LATTICE,NONEQUIV.ATOMS: P63/mmc MODE OF CALC=RELA unit=bohr ATOM -1: X= Y= Z= MULT= 2 ISPLIT= 4
5 -1: X= Y= Z= Mg1 NPT= 781 R0= RMT= Z: 12.0 LOCAL ROT MATRIX: Select R_Kmax = 8, L_max = 9, XC = pbe, and nkpoint = 3000 Select order of fit 5 and default parameters for volume and c/a changes. Since Mg is not spin-polarized system, it is not necessary to modify 2Doptimize.job file and you can run it. After running 2Doptimize.job file and ana2d_lapw, you will find the below values in Terminal and Mg.outputeos file. In the Mg.outputeos : Equation of state: EOS2 (PRB52,8064) info 2 a,b,c,d V0,B(GPa),BP,E Equation of state: Murnaghan info 2 E=E0+[B*V/BP*(1/(BP-1)*(V0/V)**BP +1)-B*V0/(BP-1)]/ Pressure=B/BP*((V0/V)**BP -1) V0,B(GPa),BP,E vol energy de(eos2) de(murnaghan) Pressure(GPa) Sigma: Equation of state: Birch-Murnaghan info 2 E = E0 + 9/16*(B/ )*V0*[(eta**2-1)**3*BP + (eta**2-1)**2*(6-4*eta**2)] --> eta = (V0/V)**(1/3) Pressure = 3/2*B*(eta**7 - eta**5)*(1 + 3/4*(BP-4)*[eta**2-1]) V0,B(GPa),BP,E vol energy de(birch-murnaghan) Pressure(GPa) Sigma: In Terminal : ##################################### Vol-opt= , coa-opt= a0= , c0= bohr a0= , c0= Ang #####################################
6
7 Our calculations Exp 1 a (Ang) c (Ang) B (GPa) ) E Wachowicz and A Kiejna, J. Phys.: Condens. Matter 13 (2001) Calculation 2-Dimensional of Equation Of State for hexagonal Be Be H LATTICE,NONEQUIV.ATOMS: P63/mmc MODE OF CALC=RELA unit=bohr ATOM -1: X= Y= Z= MULT= 2 ISPLIT= 4-1: X= Y= Z= Be1 NPT= 781 R0= RMT= 1.99 Z: 4.0 LOCAL ROT MATRIX: Select R_Kmax = 8, L_max = 9, XC = pbe, and nkpoint = 3000 Select order of fit 5 and default parameters for volume and c/a changes. Since Be is not spin-polarized system, it is not necessary to modify 2Doptimize.job file and you can run it. After running 2Doptimize.job file and ana2d_lapw, you will find the below values in Terminal and Be.outputeos file. In the Be.outputeos : Equation of state: EOS2 (PRB52,8064) info 7 a,b,c,d V0,B(GPa),BP,E Equation of state: Murnaghan info 7 E=E0+[B*V/BP*(1/(BP-1)*(V0/V)**BP +1)-B*V0/(BP-1)]/ Pressure=B/BP*((V0/V)**BP -1) V0,B(GPa),BP,E vol energy de(eos2) de(murnaghan) Pressure(GPa) Sigma: Equation of state: Birch-Murnaghan info 2
8 E = E0 + 9/16*(B/ )*V0*[(eta**2-1)**3*BP + (eta**2-1)**2*(6-4*eta**2)] --> eta = (V0/V)**(1/3) Pressure = 3/2*B*(eta**7 - eta**5)*(1 + 3/4*(BP-4)*[eta**2-1]) V0,B(GPa),BP,E vol energy de(birch-murnaghan) Pressure(GPa) Sigma: In Terminal : ##################################### Vol-opt= , coa-opt= a0= , c0= bohr a0= , c0= Ang ##################################### Our calculations Exp 1 a (Ang) c (Ang) B (GPa) ) E Wachowicz and A Kiejna, J. Phys.: Condens. Matter 13 (2001) With best wishes, Morteza Jamal m_jamal57@yahoo.com
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