Ti3+-Free Titanophosphate Glasses as Eco-Optical Glasses

概要

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The glasses containing a large amount of TiO2 are considered as eco-optical glasses with high refractive index and low density. In the present work, the phosphate glasses with high TiO2 content, which have been developed as electronic conduction glasses and are black in color due to the inclusion of relatively large amount of Ti3+ ions, were attempted to be made applicable as novel eco-optical glasses. Colorless and transparent Ti3+-free titanophosphate glasses (60-74 mol% TiO2) were successfully obtained by re-heat-treating the black glasses near glass transition temperature in the air. Binary glasses thus obtained possessed high refractive index (1.8-2.0), high dispersion and low density (3.0 g•cm-3 at most). Furthermore, the Abbe number, glass transition temperature and thermo-optic coefficient were modified by the introduction of La2O3, ZnO and K2O, respectively, into the 60TiO2•40P2O5 glass.
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