Electrical properties of A3TiB′P3O12 (A = Li, K; B′ = Zn, Cd) NaSiCON-type glasses were reported over a frequency range from 42Hz to 1MHz and at different temperatures. By means of non-linear least square fitting of the electrical data to appropriate equivalent circuits, the bulk conductivity was separated from electrode effects. The bulk dc conductivity was Arrhenius activated, with activation energies and pre-exponential factors following the Meyer–Neldel rule. The frequency- and temperature-dependent conductivity spectra of individual glasses could be superimposed by means of the Summerfield scaling. However, the master curves of different glasses do not superimpose. It was shown that this effect was related to the composition dependence of the many-particle displacement function <R2(t)>.

Lithium and Potassium Ion Conduction in A3TiB′P3O12 (A = Li, K; B′ = Zn, Cd) NASICON-Type Glasses. C.R.Mariappan, G.Govindaraj, B.Roling: Solid State Ionics, 2005, 176[7-8], 723-9