Abstract
In this paper we present conductivity spectra of the ion conducting glasses B 2O 3 · 0.56Li 2O · 0.45LiBr and Ag 2S · GeS 2 and of the polaron conducting glass 0.2P 2O 5 · 0.8 (0.89V 2O 5 · 0.11V 2O 4), covering a frequency range of more than 13 decades. At frequencies below the onset of the vibrational motion the spectra of both ion conducting glasses clearly differ from those of the polaronic glass. The dispersive conductivity of 0.2P 2O 5 · 0.8 (0.89V 2O 5 · 0.11V 2O 4) follows a simple power-law behavior, the exponent being smaller than one. In contrast, the conductivities of both ion conducting glasses show the existence of two power-law exponents; one is the Jonscher exponent, the other is larger than unity. The data are interpreted in terms of the ‘unified site relaxation model’.
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