The non-isothermal devitrification of Li2TiGe3O9 glass

The non-isothermal devitrification of a lithium titanium germanate glass of stoichiometry Li2TiGe3O9 has been studied by differential thermal analysis . The temperature of maximum nucleation rate and the value of activation en ergy for crystal growth were evaluated from DTA curves. The influence on th e crystallization process of the specific surface area of the samples and o f the heat treatments of nucleation is emphasized. The investigated glass e xhibited the same molar ratio of GeO6/GeO4 groups and the same T-g as lithi um tetragermanate glass. (C) 1998 Elsevier Science B.V.