The kinetics of crystallization of Li 2 Si 2 O 5 from glasses in the Li 2 O‐SiO 2 system were studied using quantitative X‐ray diffraction. Analysis of the data using the Johnson‐Mehl‐Avrami equation showed that crystallization occurred through the nucleation and growth of rods. The spherulitic nature of the crystals was substantiated by petrographic examinations of the partially crystalline glass. Analysis of the temperature dependence of the crystallization rate using a modification of the Johnson‐Mehl‐Avrami equation showed that the activation energy for nucleation was a function of composition and thermal treatment.
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Freiman et al. (1968) studied this question.
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