Conductivity relaxation due to Na+ ions, and the decay of radiation-induced centers as controlled by Ag+ ion diffusion, were studied in phosphate glasses with a high Na2O content. It was found that both processes exhibited a non-exponential kinetic behavior, and were satisfactorily described by the Kohlrausch function. It was noted that, at the molecular level, the above function should be considered in terms of a sum of exponential decay functions with a distribution of relaxation times, rather than as being an inherently non-exponential function.

V.M.Syutkin, V.A.Tolkatchev: Chemical Physics, 1996, 212[1], 149-56