CURRICULUM VITAE. Degree Awaited M.Phil 2007 DAVV, Indore, India Physics 70% Vikram University, India

Transcription

1 CURRICULUM VITAE Neha Gupta Research Scholar, Department of Physics, Birla Institute of Technology & Science, Pilani, Rajasthan, Pin: Contact No Educational Qualifications: Degree Year Institute/University Subject %/ CGPA Ph.D BITS, Pilani, India Solid state Ionics Degree Awaited M.Phil 2007 DAVV, Indore, India Physics 70% M.Sc DAVV, Indore, India Material Science 75%/7.9 B.Sc Vikram University, India Physics, Maths, Chemistry 74% Ph. D. Supervisor: Dr. Anshuman Dalvi Assistant Professor Birla Institute of Technology & Science, Pilani (RJ), India Ph. D. Thesis title: Thermal investigations on AgI and CuI based superionic glasses and glass ceramic composites Superionic glasses are one of the promising candidates for all-solid-state battery applications. Since glasses are thermally unstable due to crystallization, a systematic understanding of thermal properties is inevitable prior to any application. Thus thermal stability investigations on various systems have got considerable attention in last few years. Recently, we have thoroughly examined the applicability of the different thermal stability parameters e.g. Hruby coefficient, activation energies associated with structural relaxation (E s ) and crystallization (E c ), enthalpy content ( H) etc for the better understanding of ionic glasses. These parameters were obtained by non-isothermal crystallization kinetics using differential scanning calorimetry, using

2 Kissinger, Moynihan and Matusita-sakka formulations. Alternatively, some of these parameters could also be obtained by analyzing the carefully measured electrical conductivity-temperature cycles above the T g and T c at various (30-300K/h) heating rates. The parameters have been systematically calculated for fundamental AgI and CuI oxy-salt glasses and found to exhibit very interesting trends with the composition. A well-known glassy system AgI-Ag 2 O-V 2 O 5 has been chosen to demonstrate the applicability of the parameters. Effect of (i) mixed cation i.e. CuI substitution in place of AgI (ii) mixed glass modifier Cu 2 O in place of Ag 2 O and (iii) mixed glass formers (MoO 3 in place of V 2 O 5 ), on the thermal properties is thoroughly investigated. The electrical conductivity-temperature cycles at various rates were also obtained for two of the systems, viz. AgI-Ag 2 O-V 2 O 5 -MoO 3 and CuI-AgI-Ag 2 O-V 2 O 5. Interestingly, the E c and E s values obtained by DSC and -T cycles are found to be comparable. List of publications: 1. N. Gupta, A. Dalvi, Electrical, Structural and Thermal characterization of Cu 2 O substituted AgI- (Cu 2 O) x (Ag 2 O) 1-x -V 2 O 5 glassy superionic system Solid State Ionics, 225: , N. Gupta, A. Dalvi, S. Bharadwaj, A.M. Awasthi, Crystallization and glass transition kinetics in Cu + ion substituted Cu x Ag 1-x I- Ag 2 O-V 2 O 5 J. Non-Cryst. Sol., 357: , N. Gupta, A. Dalvi, Effect of mixed glass formers on the crystallization kinetics in AgI- Ag 2 O-V 2 O 5 -MoO 3 glassy superionic system Ionics 17: , N. Gupta, A. Dalvi, Thermal stability and crystallization kinetics in superionic glasses using electrical conductivity- temperature cycles J. Therm Anal Calorim 102: , N. Gupta, A. Dalvi, S. Bharadwaj, A.M. Awasthi, Electrical transport and crystallization in Cu + ion substituted AgI- Ag 2 O-V 2 O 5 glassy superionic system Sol. Stat. Ion.180: , N. Gupta, A. Dalvi, Effect of Cu 2 O substitution on glass transition and crystallization kinetics in 50AgI [(Cu 2 O) x -(Ag 2 O) 1-x ]-16.67V 2 O 5 glassy solid electrolytes (Communicated in JTAC). Conferences/Workshops Participation: Papers presented in International conferences 1. Neha Gupta, A Dalvi, A M Awasthi, S Bharadwaj, Synthesis of glassy superionic composite by microwave treatment International conference on condensed matter Physics, Jaipur Nov 25-28, 2007"

3 2. Neha Gupta, A Dalvi, S Bhardwaj, A M Awasthi and N P Lalla Characterization of glassy superionic composites prepared by microwave treatment published in Solid State Ionics Ed B V R Chowdari et al (2008) P proceedings of 11 th Asian conference on solid state ionics. 3. Neha Gupta, A. Dalvi. Effect of Cu 2 O substitution on glass transition and crystallization kinetics in 50AgI [(Cu2O)x-(Ag2O)1-x]-16.67V2O5 glassy solid electrolyte International Conference on Materials for advanced technologies, Singapore June 26- July 1, National conferences 1. Neha Gupta, Anshuman Dalvi, Barkha Awasthi, D Deva, Electrical Transport and structural investigations in Cu 2 O substituted AgI-Ag 2 O-V 2 O 5 glass ceramic nanocomposites presented in DAE- solid state Physics Symposium 2011 AIP Conf. Proc. 1447, (2011) 2. Neha Gupta, Anshuman Dalvi, Characterization of AgI and CuI based glass ceramic nanocomposites (2011) presented in NCSSI Neha Gupta, Anshuman Dalvi, D Phase, A M Awasthi Electrical transport in superionic thin films deposited by pulsed laser deposition presented in DAE- solid state Physics Symposium 2010 AIP Conf. Proc. 1349, (2011). 4. Neha Gupta, Munesh Rathore and A Dalvi Electrical and electrochemical characterization of PEO-Ag 2 SO 4 composite polymer electrolytes presented in DAE solid state Physics Symposium 2010 AIP Conf. Proc. 1349, (2011). 5. Neha Gupta and Anshuman Dalvi Thermal investigations on superionic glasses using electrical conductivity temperature cycles DAE solid state Physics Symposium M S University Baroda December published in Solid State Physics 54 (2009) P Neha Gupta and Anshuman Dalvi Investigations of thermal properties of AgI-Ag 2 O- MoO 3 -V 2 O 5 superionic glasses using electrical conductivity temperature cycles. 8 th National Conference on solid state ionics Sagar central University December Neha Gupta, Srikanth Y and Anshuman Dalvi Preparation of, mixed cation effect in KI-AgI-Ag 2 O-V 2 O 5 superionic glasses presented by N Gupta in National symposium for Materials Research Scholar at IIT Bombay May 7-8, Awards/Scholarships: 1. Poster award in 55 th DAE symposium held at Manipal University, Manipal, Karnataka, Poster award in 54 th DAE symposium held at M.S. University, Baroda, Gujarat, Young Scientist award in 8 th National Conference on Solid State Ionics Sagar, central University, M. P

4 4. Best oral presentation award in National symposium for Materials Research Scholar at IIT Bombay, Mumbai, Expertise: 1. Synthesis of materials a. Microwave assisted synthesis b. Sol gel technique c. Melt-quenched technique 2. Characterizations a. Electrical characterization i. High temperature electrical transport (from Room temperature to 1000K) 1. Conductivity temperature cycles 2. Impedance spectroscopy 3. Ionic transport number b. Structural characterizations i. X-ray diffraction ii. Scanning electron microscopy iii. Fourier transform of infrared spectroscopy c. Thermal characterizations i. Differential scanning calorimetry d. Electrochemical characterization i. Fabrication and testing of solid state button type cells and batteries. Fabrication during Ph.D. work: 1. Electric furnace ( K) 2. Sample Holders to measure the ionic conductivity of bulk, thin and thick films. Future research interests and plans: Given an opportunity, I would like to work/pursue research in the following areas- 1. Glasses: Li + ion conducting glasses, Semiconducting glasses and their characterization and applications. 2. Amorphous thin films systems (micro/nanosynthesis) 3. Polymers: conducting polymers 4. Mixed conductors

5 Personal Details: Date of Birth Gender Nationality Status Permanent address 01/09/1984 Female Indian Single 28/1 Sakhipura, Indore gate Ujjain, M.P. Pin : References: 1. Dr. Anshuman Dalvi Asst. Professor, Physics Department, BITS-Pilani (India) anshumandalvi@gmail.com Dr. Debashish Bandhyopadhyaya Associate Professor, Physics Department, BITS-Pilani (India) rajuban@gmail.com Prof. K. Hariharan, Professor, Physics Department, IIT-Madras (India) khariharan@physics.iitm.ac.in