Award Date

12-1-2014

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Physics and Astronomy

First Committee Member

Yusheng Zhao

Second Committee Member

Oliver Tschauner Tschauner

Third Committee Member

Changfeng Chen

Fourth Committee Member

Clemens Heske

Number of Pages

150

Abstract

Lithium-Rich Antiperovskites (LiRAPs) have been shown to possess relatively high ionic conductivity at room temperature, and become superionic conductors at elevated temperatures. These materials generally have a stoichiometry Li3BX, where B is a doubly deficient anion, and X is a monovalent anion. Ideally they belong to the high symmetry space group Pm-3m where lithium atoms occupy octahedral corners, B anions occupy octahedral centers, and X anions occupy the interstitial centers between the octahedra. LiRAPs were synthesized using several different methods and characterized by XRD, EIS, DSC, TGA, FTIR, and INS techniques. Chemical analyses were performed to determine the stoichiometries of the base compounds Li3OCl, Li2(OH)Cl, and Li2(OH)Br. Ionic conductivities range from 2 x 10-5 S/cm to 2 x 10-9 S/cm at room temperature, and activation energies of Li+ diffusion range from 0.49 eV to 1.02 eV.

Keywords

Chemical structure; Electric conductivity; Ionic mobility; Lithium compounds; Superionic conductors

Disciplines

Atomic, Molecular and Optical Physics | Physics

Language

English


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