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Effect of P 2 O 5 on the Crystallization of Lead Silicate Glasses
Author(s) -
CARR SANDRA M.,
SUBRAMANIAN K. N.
Publication year - 1982
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1982.tb10468.x
Subject(s) - devitrification , crystallization , nucleation , materials science , silicate , chemical engineering , mineralogy , silicate glass , chemistry , composite material , organic chemistry , engineering
The effect of P 2 O S on the devitrification of binary lead silicate glasses containing 64 and 59 mol% PbO was studied. Glasses underwent isothermal crystallization treatments at 400°, 450°, 500°, and 550°C. A polymorph of 3PbO 2 SiO 2 was the major product of crystallization for all compositions of glasses. Secondary products of crystallization were found to be a polymorph of PbOSiO 2 in the 59 mol% and a low‐temperature polymorph of 2PbOSiO 2 in the 64 mol% PbO glasses. Dominant mode of crystallization in both binary glasses was surface devitrification at all temperatures studied. Addition of P 2 O 5 promoted internal crystallization in the form of spherulites. 400°C was found to be the most effective temperature for nucleating spherulitic growth. Crystallization at 400°C led to high concentrations of spherulites in all glasses containing at least 0.5 mol% P 2 O 5 . Concentrations of 0.5 mol% P 2 O 5 were needed to produce detectable levels of spherulitic nucleation at r<400°C.