Comprises (wt%): 40-46 B2O3, 32-38 La2O3, 10-13 ThO2, 1-8 MgO, 2-11 SrO and 1-9 BaO, the sum of La2O3 and ThO2 being 44-48 and the sum of MgO, SrO and BaO being 10-15.
Origin
Unknown
Journal Title
Jap P 73/43651, 20/12/73
Sector
Refractive Indexes
Class
RI 12