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VARIATIONS OF REFRACTIVE INDEX OF GLASS WITH TIME AND TEMPERATURE IN ANNEALING REGION *
Author(s) -
McMaster Harold A.
Publication year - 1945
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.1151-2916.1945.tb14483.x
Subject(s) - borosilicate glass , refractive index , annealing (glass) , analytical chemistry (journal) , constant (computer programming) , thermodynamics , mineralogy , materials science , chemistry , composite material , chromatography , physics , optoelectronics , computer science , programming language
A bstract The refractive index of a rapidly cooled fiber of borosilicate glass was found to increase according to the equation, 1/( N 6 – N ) – 1/( N 6 – N 0 ) = At , where t is time, N 6 is equilibrium index, and A is a constant at constant temperature. Index data were plotted according to this equation to determine, graphically, values of N 6 and A for several temperatures between 914° and 1060°F. Values of N 6 for temperatures from 1060° to 1180°F. were determined by prolonged heating of the glass at each 20° interval. The change of A with temperature was found to be well represented by the equation, log A = K/T + C , where T is the absolute temperature and K and C are constants.