The Kinetics of Crystallization of Solid Solutions in a Glass
of the Stoichiometric Composition Na₂O 2CaO 3SiO₂

V. M. Fokin¹, O. V. Potapov², V. L. Ugolkov², E. D. Zanotto³, and F. M. Spiandorello³

¹ Vavilov State Optical Institute, Birzhevaya liniya 12, St. Petersburg, 199034 Russia

² Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences,
ul. Odoevskogo 24/2, St. Petersburg, 199155 Russia

³ San Carlos Federal University, San Carlos, Brazil

Abstract—The crystallization of a glass of the stoichiometric composition Na₂O · 2CaO · 3SiO₂ 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.

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