The kinetics of crystallization of solid solutions in a glass of the stoichiometric composition Na2O • 2CaO • 3SiO2

The crystallization of a glass of the stoichiometric composition Na2O . 2CaO . 3SiO(2) was shown to proceed with the nucleation and growth of solid solution crystals whose composition was enriched in sodium compared with the initial glass and approached the stoichiometric composition during the phase transition. Crystal growth was accompanied by changes in the composition of the glass in a partially crystallized sample, which in turn caused nucleation termination at the early phase transition stages and slowed down the growth of nuclei. The reason for the nucleation of crystals with a shifted composition is discussed within the framework of the classic nucleation theory.