Atomic & Molecular Physics
Banaras Hindu University
Academic Qualifications: S. No. Degree Institution Year 1. B.Sc. C.S.J.M. University, Kanpur, U.P., India 1998 2. M.Sc. C.S.J.M. University, Kanpur, U.P., India 2000 3. Ph. D. Uttar Pradesh Technical University, Lucknow, U.P., India 2007
Chalcogenide glasses are well known as optical materials for their applications in phase-change optical recording technique and infrared fibre optics. A lot of research work has been done on chalcogenide glasses; however the basic physics of these materials have not reached to a level, which is required to develop devices at par with crystalline semiconductor devices. Even after many extensive works, many important problems are still unanswered e.g. the exact nature of energy distribution of different defect states, the role of impurities, the exact recombination process, contact effect, thermal relaxation effect and dielectric relaxation. These days, I am engaged in studying dielectric-relaxation studies in chalcogenide glasses, crystallization kinetics / glass transition kinetics of chalcogenide glass under various conditions for both application and technological purposes. The following work has been done on different glassy systems in last three years:
Composition dependence of the activation energy of glass transition in some chalcogenide glasses N. Mehta & A. Kumar Philosophical Magazine Letters, 88 (2008) 793-800.
Investigation of compensation effect for isothermal crystallization in glassy Se80-xTe20Mx (M = Cd, Ge, Sb) alloys N. Mehta, D. Kumar & A. Kumar Journal of Physics D: Applied Physics, 38 (2005) 3953-3957.
Effect of slow neutron radiation on the pre-exponential factor of thermally activated crystallization in Se96In4 chalcogenide glass N. Mehta, K. Singh & N. S. Saxena Journal of Physics D: Applied Physics, 41 (2008) 135406