Adiabatic nucleation in devitrifying “fragile” oxide glasses

Abstract

AbstractA simple adiabatic nucleation theory predicts nucleation rates in “fragile” oxide glasses (T00/Tg > 0.6, where T00 is the Fulcher temperature and Tg is the glass transition temperature) with an average deviation of only nine orders of magnitude (too high) and shows (within this uncertainty) correctly which glasses present devitrification and which ones do not, in experiments during “laboratory times.” The theory could not yet be extended to “strong” glasses because of the very low Fulcher temperatures of these glasses (T00/Tg < 0.6), where the Stokes‐Einstein relation loses its validity completely and where viscosity extrapolations from above Tg get very uncertain. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)