Abstract
Crystallization process of sodium indium borosilicate glasses doped with Cr 3+ has been examined. InBO 3:Cr 3+ precipitates as a single phase from 26.85Na 2O·44.75B 2O 3·17.9SiO 2·10In 2O 3·0.5Sb 2O 3·0.1Cr 2O 3 glass. A comparison of fluorescence spectra between glass-ceramic and polycrystalline InBO 3:Cr 3+ indicates that Cr 3+ is incorporated in the InBO 3 phase in the glass-ceramic specimen. Optical absorption and fluorescence measurements reveal that Cr 3+ ions occupy sites with high ligand fields in the glass whereas the ligand field strength of Cr 3+ ion site in the InBO 3 crystal is low; the ligand fields of sites for the Cr 3+ ions vary from high to low states with the crystallization of the glass. This trend is opposite to a tendency usually observed in the precipitation process of crystals doped with Cr 3+ from oxide glasses. The origin for the high ligand field in the sodium indium borosilicate glass is speculated by considering the role of In 3+ ions in the glass structure.
Published Version
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