| Fabrication of La2O3-TiO2-SiO2 System Glass Derived from a Sol-Gel Process |
| Mitsunobu Iwasaki, Hitoshi Masaki, Seishiro Ito, Won-Kyu Park1 |
Department of Apply Chemical, Kinki University
1Department of Material Engineering, Graduate School of Paichai University |
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| ABSTRACT |
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$La_{2}O_{3}-TiO_{2}-SiO_{2}$ glass, a type that could not obtained so far by the conventional melting method, was prepared successfully using a sol gel process. Glass derived with the sol-gel process has compositions of $5La_{2}O_{3}-5TiO_{2}-90SiO_{2},;5La_{2}O_{3}-10TiO_{2}-85SiO_{2}$, and $5La_{2}O_{3}-20TiO_{2}75SiO_{2}$. The UV-visible absorption edge of all glass compositions was below 400 nm. The measured density is in the range of 2.55-2.89, and was nearly identical to the calculated density and the refractive index of the glasses derived from the sol-gel ranges from 1.545 to 1.645. The molar additive coefficient of $TiO_{2}$ measured in this ternary system is lower than the calculated value, while the value of $La_{2}O_{3}$ is higher. |
| Key words:
Sot-gel process, $La_{2}O_{3}-TiO_{2}-SiO_{2}$ glass, Low density, High refractive index |
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