Premium
Thermooptic Coefficients of Soda–Lime–Silica Glasses
Author(s) -
Jewell John M.
Publication year - 1993
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.1151-2916.1993.tb06659.x
Subject(s) - soda lime , thermal expansion , mineralogy , silica glass , polarizability , materials science , analytical chemistry (journal) , lime , thermodynamics , chemistry , composite material , metallurgy , organic chemistry , physics , molecule
The thermooptic coefficients, d n /d T , of two series of soda–lime–silica glasses, 25Na 2 O· x CaO·(75 – x )SiO 2 and (25 – y )Na 2 O· y CaO·75SiO 2 , have been measured. When CaO is substituted for SiO 2 , the magnitude of d n /d T passes through a maximum negative value. When CaO is substituted for Na 2 O, there is a monotonic change from negative to positive d n /d T . These effects are accounted for by the changes in relative values of the coefficient of thermal expansion and the temperature coefficient of electronic polarizability, Θ. The effect of composition on Θ is explained by the changes in density of various nonbridging and bridging oxygens in the glass.