The conductivity relaxation in the frequency range from 10 Hz to 2 MHz and in the temperature range from 108 to 303 K for the fast ion conducting AgI-Ag2O-MoO3 glasses has been reported. It has been observed that the conductivity relaxation in these glasses is highly nonexponential and that the conductivity relaxation mechanism is independent of temperature but is dependent on composition. It has been further observed that the motion of Ag+ ions is decoupled more and more from the viscous motion of the glassy matrix with the increase of AgI content in the composition, giving rise to the increase of the conductivity. (c) 2005 Elsevier B.V. All rights reserved.