Dielectric relaxation in chalcogenide glasses has been a subject of high controversies. In glasses, there is a wide distribution of relaxation time hence loss peaks are not observed with frequency as one expect in dielectric relaxation phenomena. I have made dielectric measurements on various chalcogenide glasses. The results indicate that dielectric dispersion does exist in these materials in the audio and radio frequency range. Dielectric loss show frequency dependence but loss peaks could not be observed. Hence relaxation time could not be calculated. The results could, however, be explained in terms of hopping of charge carriers over a potential barrier between charged defect states. You can go through my research gate profile toto see the papers published by me to get the references on this topic.

Very good question Prof. Ahmed,