Lithium ion dynamics in Li2S+GeS2+GeO2 glasses studied using 7Li NMR field-cycling relaxometry and line-shape analysis

摘要: Abstract We use 7 Li NMR to study the ionic jump motion in ternary 0.5Li 2 S+0.5[(1– x )GeS + GeO ] glassy lithium ion conductors. Exploring “mixed glass former effect” this system led assumption of a homogeneous and random variation diffusion barriers system. exploit that combining traditional line-shape analysis with novel field-cycling relaxometry, it is possible measure spectral density broad frequency temperature ranges and, thus, determine distribution activation energies. Two models are employed parameterize data, namely, multi-exponential autocorrelation function model power-law waiting times model. Careful evaluation both these indicates broadly inhomogeneous energy landscape for single ( =0.0) mixed =0.1) network glasses. The can be well described by Gaussian barriers. Applicability methods used their sensitivity microscopic details discussed.