Glass has RI > 1.89 and Abbe number > 27.0. Composition is (wt%): 13.0-20.0 B2O3, 16.0-35.0 La2O3, 20.0-45.0 ThO2, 0-25.0 Ta2O5, 0-30.0 Nb2O5, 3.0-8.0 ZrO2, 0-7.0 TiO2, 0-5.0 ZnO, 0-2.0 WO3 with the proviso that 45.0-60.0 (La2O3 + ThO2), 14.0-30.0 (Ta2O5 + Nb2O5) and 0-8.0 (ZnO + TiO2 + WO3).
Origin
Unknown
Journal Title
Jap P 03463/71, 28/1/71
Sector
Refractive Indexes
Class
RI 24