Elsevier

Solid State Ionics

Volume 73, Issues 3–4, November 1994, Pages 199-208
Solid State Ionics

Frequency-dependent ionic conductivity in AgI-AgPO3 glasses

https://doi.org/10.1016/0167-2738(94)90035-3Get rights and content

Abstract

Ac conductivity measurements have been performed on the superionic glassy system (AgI)x(AgPO3)1−x, It is found that there are two contributions to the ac conductivity: one, dominant at high temperatures/low frequencies, is characterised by a sublinear frequency exponent of the conductivity, s1⋍0.5, and the conductivity is thermally activated, with an activation energy smaller than, but comparable to, that of the dc conductivity; the second, dominant at low temperatures/high frequencies, is characterised by a superlinear frequency exponent, s2⋍1.2, and the conductivity is also thermally activated, but the activation energy is an order of magnitude smaller. The former behaviour is interpreted in terms of the diffusion-controlled relaxation model, and the latter in terms of local ionic hopping motion within a double-well potential with an exponentially decreasing distribution of barrier heights.

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