Ceramics-Silikáty 53, (3) 187 - 188 (2009) |
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EFFECT OF ADDED TiO₂ AND ZrO₂ ON THE CRYSTALLIZATION OF Li₂O - SiO₂ GLASSES: THERMAL AND DIFFRACTION PROPERTIES
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Jóna Eugen, Moricová Katarína, Pavlík Viliam,
Ondrušová Darina,
Pajtášová Mariana
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Department of Inorganic Materials and Environmental Engineering, Faculty of Industrial Technologies
Trenčín University of Alexander Dubček, 02 032 Púchov, Slovak Republic
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Keywords: Crystallization of Li₂O - SiO₂ glasses, Thermal properties, Diffraction analysis
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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. |
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