Transparent and High Refractive Index La_2O_3-WO_3 Glass Prepared Using Containerless Processing

摘要

Transparent and high refractive index 0.2La_2O_3·0.8WO_3 glass was prepared in bulk form using containerless processing. The glass transition temperature, crystallization onset temperature, and melting temperature were 553℃, 594℃, and 1043℃, respectively. The glass was colorless and widely transparent, in the visible to infrared region, indicating that the valence state of the W ion was 6. The refractive index was 2 in the visible range, and the Abbe number estimated from the Drude-Voigt relationship was 24. These results indicate that the La_2O_3-WO_3 glass would be useful for optical applications in the visible to infrared region.