Dynamics and crystal chemistry of tellurites.: II.: Composition- and temperature-dependence of the Raman spectra of x(Tl2O)+(1-x) Te2O glasses:: evidence for a phase separation?

Immiscibility effects are suggested to be inherent in tellurite glasses with weak (low valence) cations. This hypothesis is used to explain the structural evolution of the x(Tl2O) + (1 - x)Te2O glass system as a function of the x value and during temperature-induced crystallisation processes. The results of Raman measurements support the hypothesis. (C) 2003 Elsevier Ltd. All rights reserved.