Abstract
Three glasses with the composition of Li 2 O·2SiO 2 (a), Li 2 O·2SiO 2 ·0.03TiO 2 (b) and Li 2 O·2SiO 2 ·0.1TiO 2 (c) were prepared and the relationship between structural and kinetic parameters of thermal stability vs. crystallization has been studied by X-ray diffraction, IR spectra and thermal analysis. The XRD patterns proved the presence of lithium metasilicate as a primary crystalline phase which subsequently transformed to lithium disilicate where the transformation is supported by the presence of TiO 2 . The order of thermal stability vs. crystallization of studied glass systems based on the results of XRD is (a)<(b)<(c). The same order was obtained from the values of activation energy. It has been shown that the values of activation energies obtained from the Ozawa and Kissinger methods are equivalent and that the Kissinger method should be used to obtain the activation energy from the dependence of the maximum peak temperature on the heating rate. It has been discussed that the activation energy represents only an incomplete description of the kinetics of the crystallization process.
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