Ceramics-Silikáty 53 (3) 187-188 (2009)

EFFECT OF ADDED TiO₂ AND ZrO₂ ON THE CRYSTALLIZATION OF Li₂O - SiO₂ GLASSES: THERMAL AND DIFFRACTION PROPERTIES

E. Jóna, K. Moricová, V. Pavlík, D. Ondrušová, M. Pajtášová

Five glasses with the composition of Li₂O - 2 SiO₂ (a), Li₂O 2 SiO₂ - 0.03 TiO₂ - 0.03 ZrO₂ (b), Li₂O - 2 SiO₂ - 0.05 TiO₂ - 0.05 ZrO₂ (c), Li₂O - 2 SiO₂ - 0.075 TiO₂ - 0.075 ZrO₂ (d), Li₂O - 2 SiO₂ - 0.1 TiO₂ - 0.1 ZrO₂ (e) were prepared and the relationship between structural and kinetic parameters of thermal stability vs. crystallization has been studied. The XRD patterns proved of the presence of lithium metasilicate as a favoured crystallization phase. The order of thermal stability vs. crystallization of studied glass systems based on the values of activation energy is a ≈ b < c< d < e. It has been shown that the values of activation energy obtained from the Ozawa and Kissinger are equivalent.

Keywords: Crystallization of Li₂O - SiO₂ glasses, Thermal properties, Diffraction analysis