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Thermal Expansion of Some Simple Glasses
Author(s) -
KARKHANAVALA M. D.,
HUMMEL F. A.
Publication year - 1952
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.1151-2916.1952.tb13105.x
Subject(s) - thermal expansion , noble gas , silicate , materials science , silicate glass , glass transition , mineralogy , analytical chemistry (journal) , thermodynamics , chemistry , composite material , polymer , organic chemistry , physics
In order to obtain a better understanding of the contribution of various oxides to the thermal expansion of silicate glasses, a number of glasses of widely different compositions were examined. In contrast with the viscosity, the thermal expansion in the range 25° to 150°C. is not materially affected in glasses containing more than 67 mole % SiO 2 if a noble‐gas‐type cation * is replaced by a non‐noble‐gas‐type cation † of the same size and charge. In such high‐silica glasses, the substitution of a noble‐gas‐type cation of a larger size for a similar cation of a smaller size increases the coefficient of expansion. The increased expansion, which is noticeable in glasses above the transition range, and the difference in the expansion characteristics of the chilled and annealed glasses gradually diminish as the basicity of the glass increases.