The dynamics of Li ions in lithium bismuthate glasses were studied at frequencies ranging from 10Hz to 2MHz at 323 to 543K. The compositional dependence of the direct-current conductivity was explained in terms of the structure of the glasses. The activation energy was analyzed within the framework of the Anderson-Stuart model. An additional energy term, which arose from the Madelung constant of the glass and the polarizability of the Bi ions, was suggested to explain a discrepancy between the calculated and experimental values. The relaxation mechanism in these glasses was studied by using the modulus and conductivity formalisms, and the microscopic parameters which resulted from the analysis were compared. The stretched-exponential relaxation parameter, and the direct-current conductivity were correlated with the decoupling index.

Dynamics of Lithium Ions in Bismuthate Glasses. A.Pan, A.Ghosh: Journal of Chemical Physics, 2000, 112[3], 1503-9