By studying pressure- and temperature-dependent direct-current conductivities, activation volumes and energies were found for Ag+-ion motion in glasses of the AgI-AgPO3 and KI-AgPO3 systems. In the former glasses, both parameters decreased monotonically with increasing AgI content. In the latter glasses, the activation volumes and activation energies attained maximum values before decreasing at high KI contents. An apparently strong coupling between activation volumes and energies suggested that the free volume played a predominant role in conductivity enhancement in the strongly doped glassy electrolytes.

Effects of Pressure on the Ionic Conductivity of AgI–AgPO3 and KI–AgPO3 Glasses. M.D.Ingram, B.Macmillan, A.J.Pappin, B.Roling, J.M.Hutchinson: Solid State Ionics, 1998, 105[1-4], 103-7