Abstract
The conductivity enhancement observed in the two glass systems A (40Li2O–(60–x)P2O5–xGeO2) and B (40Li2O–10B2O3–(50–x)P2O5–xGeO2) as the germanate content is increased from 0 to 25 mol % confirms the positive mixed glass-former effect (MGFE) in these systems. In this study, we further employ state-of-the-art NMR techniques along with Raman spectroscopy to probe the local network structures. We use the MIGRATION concept to model the experimental conductivity and permittivity spectra obtained from impedance spectroscopy to understand the scaling features of the spectra and to calculate the value of the spatial extent of the localized diffusion of the lithium ion. As x increases from 0 to 25 mol %, for system A, a continuous increase of the POGe cross-linkages as well as a continuous and strong modification of the phosphate network is observed. In system B, deeper analysis of the 31P magic-angle spinning NMR experiments done using 2D 11B/11B homonuclear and 11B/31P heteronuclear NMR is used to determine the ...
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