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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 39  1980
Line Shape of the Chromium (VI) Absorption Band in Sodium Borate and Sodium Silicate Glasses
A. PAUL
Pages : 71-79
DOI : 10.1080/0371750X.1980.10840726
Abstract
The effect of temperature on the line Shape of the ultraviolet absorption bands of chromium (VI) in ditrerent (1-x) Na20, xB20 8 (where x varied from 0.1 to 0.33), and in a 0.3Na20, 0.7Si02 glass was studied. The ultraviolet absorption of chromium (VI) in these glasses is characterised by two charge transfer bands centred around 250-270 nm and 35()....:370 nm, the location of the centre of absorption and relative intensities of the two bands depending on the borochromate/chromate ratio in the glass which in turn is dependent on the chemical composition of the glass. The 35()....:370 nm band has been found to be Gaussian at the top half of absorption, and exponential with wave-number at the low-energy tail of the band obeying Urbachs Rule. In all the glasses, the energy of absorption maximum decreased linearly with increasing temperature, and the bands became broader. The change in intensity of chromium (VI) absorption in ditrerent glasses with varying temperature has a satisfactory correlation with thermal expansion coefficient of these glasses strongly indicating a photon-phonon interaction in these cases.
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