Dielectric study of v2O5-1.6 H2O xerogel in the broad frequency range (10^5-10^10 hz)

Abstract

The first experimental results concerning the dielectric properties of V2O5-1.6 H2O xerogel in a broad frequency range (105-1010 Hz) are presented between the temperatures 198 K and 296 K. The dielectric spectra exhibit four behaviour types : a) a low frequency effect due to the diffusion of charge carriers H+ protons ; b) two dielectric relaxations due to the two kinds of water : water strongly-bonded and water weakly-bonded to the V2O5 ribbon; c) a dielectric relaxation which would be due to a fast rotation of the H3O+ ions. One explanation of these mechanisms with respect to the experimental results is proposed.