Effect of Ag2O on the conductive behaviour of silver vanadium tellurite glasses

The effect of the Ag2O on the conductivity of vanadium tellurite glasses has been studied by using the impedance spectroscopy in a wide range of temperature. The obtained results confirm the existence of a transition from a typically electronic (polaronic) conductive regime when the molar fraction (X) of Ag2O is equal to 0, to a ionic conductive regime when X tends to 1. This transition is characterized by a deep minimum in the electrical conductivity of about 3 orders of magnitude. (C) 2000 Elsevier Science BN. All rights reserved.