High Refractive Index of 0.30La_2O_3-0.70Nb_2O_5 Glass Prepared by Containerless Processing

摘要

A high-refractive-index glass with the composition of 0.30La_2O_3-0.70Nb_2O_5 was prepared in bulk form by containerless processing without using network former oxides. The glass transition temperature was 725 ℃ and the first crystallization peak temperature was 805 ℃. The glass was colorless and transparent from 345 nm to 7.3μm. The refractive index was higher than 2.3 in the visible range, and the Abbe number estimated from the Drude-Voigt relationship was 20.4. These results indicate that the niobate glass system would be useful for optical applications in the visible to infrared region.