Glasses with RI>1.82 comprise (wt%): 15-30 B2O3, 12-60 La2O3, 0-50 ThO2, 4-22 Nb2O5, less than 5 Ta2O5 and less than 10 divalent metal oxide. The balance, if any, consists of any compatible constituents but excludes any content of CdF2.
Origin
Unknown
Journal Title
Bp 1 109 698, 10/4/68
Sector
Refractive Indexes
Class
RI 34