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Thermal Expansion of Alkali Borate Glasses
Author(s) -
SHELBY J.E.
Publication year - 1983
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.1151-2916.1983.tb10023.x
Subject(s) - alkali metal , thermal expansion , rubidium , boron , lithium (medication) , potassium , inorganic chemistry , materials science , oxide , mineralogy , boron oxide , sodium , chemistry , metallurgy , organic chemistry , medicine , endocrinology
The thermal expansion behavior of lithium, sodium, potassium, and rubidium borate glasses was measured. The results indicate that the “borate anomaly” in the thermal expansion coefficient occurs at ∼20 mol% alkali oxide. A maximum in the glass transformation and dilatometric softening temperatures also occurs at ∼27 mol% alkali oxide. No evidence for phase separation was observed in this study. These effects are related to the structural changes reported for these glasses by Bray and coworkers.