Two separate Li+ ionic motions observed by 7Li and 11B NMR in xLi2S + (1 − x)B2S3 glassy fast ionic conductors
✍ Scribed by K.H. Kim; D.R Torgeson; F. Borsa; S.W. Martin
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 851 KB
- Volume
- 90
- Category
- Article
- ISSN
- 0167-2738
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✦ Synopsis
Studies of ion dynamics in the highly conductive glassy fast ionic conductor (FIC) xLi,S + (1 -n)B,S, (X = 0.65 and 0.70) were made with NMR nuclear spin lattice relaxation (NSLR) R, (w. T) of both mobile 'Li and immobile ' 'B ions, and 'Li NMR line narrowing SV(T). The possible dependence of ion dynamics on the short range order structures (SRO) and the distribution of activation energies (DAE) in this highly conductive FIG was investigated. Two Gaussian DAE were employed to fit 'Li NSLR data, where each Gaussian DAE was correlated to a separate "B NSLR in a BS, and in a BS, group. The long range diffusion of Li ions among BS, groups and a seemingly localized ionic hopping motion around BS, group is suggested as a microscopic model for the ion dynamics in thioborate glasses, namely a 'two channel relaxation'.