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Title: Thermal stability investigations on Ag ion conducting superionic glasses and glass ceramic nano composites
Researcher: Neha Gupta
Guide(s): Dr. Anshuman Dalvi
Keywords: Superionic glass
University: Birla Institute of Technology and Science
Completed Date: 1/7/2012
Abstract: Superionic glasses are the promising candidates as electrolytes 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. Somehow, thermal stability investigations on various glassy systems have got considerable attention only in last few years. Secondly, glass-ceramic nano composites obtained from glasses have also attracted the scientific community only recently due to their better stability and interesting electrical and structural properties. Thus a thorough investigation on thermal stability of superionic glasses is indeed essential and in view of this the present investigation is undertaken. A fundamental well known system Ag+ ion conducting glassy superionic system AgI-Ag2O-V2O5 is chosen to realize the applicability of different thermal stability formulations proposed by various workers, (e.g. crystallization kinetics using Kissinger, Matusita-sakka methods and glass transition kinetics using Moynihan formulation) using differential scanning calorimetry. Thus the parameters like activation energy of structural relaxation (Es) at Tg and crystallization (Ec), enthalpy content (rH), Hruby coefficient (kgl) could be obtained and their trend with composition is analyzed. Alternatively, some of these parameters could also be obtained by analyzing the carefully measured electrical conductivity-temperature cycles above the Tg and Tc at various (30-300K/h) heating rates. Thus, in the present work it is demonstrated that and#963;-T cycles, if used accurately and effectively, can be further developed as an alternative method to study the thermal stability of the glasses.
Pagination: 31MB
Appears in Departments:Physics

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