Evaluation of the number density of nuclei in Li2O·2SiO2 glass by DTA method

DTA measurements were performed to obtain the crystallization peak temperature, TC, for Li2O·2SiO2 glass heat-treated for nucleation. The relationship between TC and the number density of nuclei was obtained. Calculation of TC was performed by simulating the crystallization process, and the effects of the size and the number density of nuclei formed during DTA measurement on TC was evaluated. The calculated relationship between the number density of nuclei and TC agreed with the experimental one, and it was shown that the effects of the size and the number density of nuclei formed during DTA measurements is negligible in the evaluation of the number density of nuclei by TC. The steady state nucleation rate for the Li2O·2SiO2 glass evaluated by DTA agreed well with the literature.