New insights into ionic motion in glasses from NMR relaxation and conductivity in lithium fast ion conducting glasses.

Session Q13 - DCMP: Elemental and Compound Glasses
Invited session, Friday morning, March 24, 8:00
Room B4, San Jose Convention Center

[Q13.01] New insights into ionic motion in glasses from NMR relaxation and conductivity in lithium fast ion conducting glasses.

D. R. Torgeson,K-H. Kim,F. Borsa,S. W. Martin (Ames Laboratory$^*$ and Iowa State University, Ames, IA 50011),I. Svare (Department of Physics, University of Trondheim, Norway)

Using Gaussian distributions of activation energies to characterize the disorder in glasses, for the thermally activated Li ^+ ionic motion in 0.56Li _2 S + 0.44SiS _2 , 0.6LiCl + 0.7Li _2 O+B _2 S _3 , and three xLi _2 S + (1-x)GeS _2 glasses, we fit the NMR NSLR R _1 (T, ømega ) yielding E _a act. energies and \Delta E _a energy widths. The temperature dependent ion conductivity was derived from a continuous time random walk model using the same Gaussian distribution from NMR but truncated near the percolation limit. This method was successful in fitting the temperature dependence of the low frequency ac conductivity for all the glasses listed above. Variation of E _a with composition x will be reported for three xLi _2 S + (1-x)GeS _2 glasses. * Operated for the USDOE by Iowa State University under Contract No. W- 7405-Eng-82.

Part Q of program listing