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Ti 3+ ‐Free Titanoborophosphate Glasses as Molding Glasses with High Refractive Indices
Author(s) -
Hashimoto Tadanori,
Murakami Mika,
Nasu Hiroyuki,
Ishihara Atsushi,
Kunii Koki
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03003.x
Subject(s) - materials science , analytical chemistry (journal) , phosphate glass , glass transition , nuclear chemistry , mineralogy , composite material , doping , chemistry , optoelectronics , polymer , chromatography
Ti 3+ ‐free titanoborophosphate TiO 2 –B 2 O 3 –P 2 O 5 (TBP)‐based glasses were produced in order to obtain glasses with low T g (<600°C), high n d (>1.8), and a short postannealing (PA) time (less than a few days). In addition, TBP‐based glasses with low T g (<570°C), high n d (>1.85), and a short PA time were successfully developed with the substitution of Li 2 O and ZnO for B 2 O 3 . Some glasses had very suitable properties for precision glass molding ( T g =553°C, n d =1.851, PA time=4 days for 6Li 2 O·6ZnO·55TiO 2 ·6B 2 O 3 ·27P 2 O 5 glass; T g =563°C, n d =1.880, PA time=2 days for 5Li 2 O·60TiO 2 ·10B 2 O 3 ·25P 2 O 5 glass; T g =566°C, n d =1.885, PA time=3 days for 2.5Li 2 O·2.5ZnO·60TiO 2 ·10B 2 O 3 ·25P 2 O 5 glass; and T g =567°C, n d =1.890, PA time=1 day for 5Li 2 O·5ZnO·60TiO 2 ·5B 2 O 3 ·25P 2 O 5 glass). The λ 70% of TBP‐based glasses with n d >1.85 and commercially available molding glasses with n d >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 g , and high n d .