Ti^sup 3+^-Free Titanoborophosphate Glasses as Molding Glasses with High Refractive Indices

...-free titanoborophosphate ... (TBP)-based glasses were produced in order to obtain glasses with low T... (1.8), and a short postannealing (PA) time (less than a few days). In addition, TBP-based glasses with low T... (1.85), and a short PA time were successfully developed with the substitution of Li...O and ZnO for ... Some glasses had very suitable properties for precision glass molding (T...=553...C, n...=1.851, PA time=4 days for ... glass; T...=563...C, n...=1.880, PA time=2 days for ... glass; T...=566...C, n...=1.885, PA time=3 days for ... glass; and T...=567...C, n...=1.890, PA time=1 day for ... glass). The ... of TBP-based glasses with n...>1.85 and commercially available molding glasses with n...>1.85 are 40 - 41 and 44 - 50, respectively, which means that these new glasses have even higher transparency in the visible region than those currently on the market. Thus, TBP-based glasses are considered to be promising materials as molding glasses with high transparency, low T..., and high n... (ProQuest: ... denotes formulae/symbols omitted.)