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Stability of Birefringence in Glass Articles
Author(s) -
GHERING L. G.,
PRESTON F. W.
Publication year - 1950
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.1151-2916.1950.tb14142.x
Subject(s) - birefringence , annealing (glass) , materials science , atmospheric temperature range , composite material , optics , mineralogy , chemistry , thermodynamics , physics
If strain is induced in disks of window glass by relatively rapid cooling in the annealing range (about 500 °C.), the birefringence seems to be permanent in its entirety at room temperatures (about 30 °C.). Even the most delicate polariscopes fail to detect any change in 11 years. At temperatures far below the annealing range, however, it is possible to remove some of this strain. Sometimes 5 to 10% can be removed at temperatures of 180° and 200 °C. in a period of 30 days. At 200 °C. a second 30‐day heating period produced no further change; at 250 °C., it produced another slight decrease.