S. V. Stolyar* and I. N. Anfimova
Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences,
nab. Admirala Makarova 2, St. Petersburg, 199034 Russia
*e-mail: stolser@yandex.ru
Received April 16, 2010
Abstract—The phase separation of sodium borosilicate glass with small additions of phosphorus and fluorine
oxides has been investigated using dilatometry at a temperature of 550C (the heat treatment time varies from
0.05 to 500 h). Two glass transition temperatures have been revealed in the dilatometric curves at heat treatment
times of 65 h and more. The results indicate that the time of 65 h is enough to complete the phase separation in
the glass at a temperature of 550C.
Keywords: Na2O–B2O3–SiO2 system, F and P additions, phase separation, two-phase glasses, glass transition
temperature
DOI: 10.1134/S108765961103014X
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