Modèle de conduction protonique dans un aluminosilicate
Abstract The measurements of dielectric losses, at variable temperature (up to 370K) and variable frequency (10 3 −10 6 Hz), are performed on an aluminosilicate (Si 4 Al 4 O 10 5(OH) 8 ). Analysis of the results leads to the development of a model of a.c. conductivity in this material. The charge carriers are protons and the conductivity is due to a hopping phenomenon between localized sites involving thermal activation. The experimental law, Aω s , is founded theoretically ; the parameter s is constant and equal to 0.83. The number of sites is evaluated and related to the adsorption process of water.