Abstract
Glasses of the ternary system 2TeO 2 xK 2O(1− x)V 2O 5 have been prepared for x=0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 mol%. For each composition only one glass transition T g is observed in the temperature range 497–517 K. For each composition, the conductivity data were obtained in the temperature range 323–473 K, using impedance techniques. They obey an Arrhenius relationship with a composition independent pre-exponential factor. The isothermal conductivity curves exhibit a sharp minimum near x=0.5. The experimental data suggest that a polaron hopping mechanism operates in the electronically conducting domain of 0≤ x<5 and an interstitial pair mechanism operates in the ionically conducting domain of 0.5< x≤1. The very low conductivity expected for x=0.5 could be explained by assuming that, for this composition, both ionic and electronic paths would not percolate any more.
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