It was noted that rapid progress had been made, during the past 10 years, with regard to the fundamental mechanisms of electrical relaxation and ionic transport in ionically conducting glasses. Many new experimental results and computer simulations had appeared during this period. But it was pointed out that this more recent work should not be allowed to obscure the importance of earlier efforts. Much of the earlier work had established the fundamental basis for more recent developments, and was still of great importance. Those phenomena which had been firmly established, and the critical experimental facts which had been gathered, were pointed out in this review with the aim of stimulating debate and leading to a consensus concerning certain critical experiments. These fundamental experimental facts would then be available as a bench-mark for future theories.

K.L.Ngai: Journal of Non-Crystalline Solids, 1996, 203, 232-45