Kinetics of Crystal Nucleation of Na_2O centre dot 2CaO center dot 3SiO_2-Based Solid Solutions in Glasses of the Na_2SiO_3-CaSiO_3 Pseudobinary Join

摘要

The kinetics of crystal nucleation is investigated in sodium calcium silicate glasses of two compositions (22.4 and 24.4 mol % Na_2O),which belong to the Na_2SiO_3-CaSiO_3 pseudobinary join and,according to the phase diagram,lie in the region of the formation of solid solutions between the compositions Na_2O centre dot 2CaO centre dot 3SiO_2 and Na_2O centre dot CaO centre dot 2SiO_2.The stationary rate of crystal nucleation of Na_2O centre dot 2CaO centre dot 3SiO_2-based solid solutions is measured as a function of temperature.It is shown that the maximum stationary rate of nucleation increases with an increase in the sodium oxide content in the initial glasses.The experimental data are analyzed in the framework of the classical nucleation theory.