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Effect of substituting Al2O3 and ZrO2 on thermal and optical properties of high refractive index La2O3–TiO2 glass system prepared by containerless processing |
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| Authors: | H. Inoue Y. Watanabe A. Masuno M. Kaneko J. Yu |
| Affiliation: | aInstitute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan;bDepartment of Innovative and Engineered Materials, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan;cISS Science Project Office, Japan Aerospace Exploration Agency, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan |
| Abstract: | La4Ti9O24 glass and La2O3–TiO2–Al2O3 and La2O3–TiO2–ZrO2 glass systems were prepared by containerless processing. The thermal stability and refractive indices of these glasses were investigated. It was found that these glasses had high refractive indices over 2.29 and high glass transition temperatures. The effects of substituting Al2O3 or ZrO2 for La2O3 or TiO2 in La4Ti9O24 glass on the refractive index is discussed by analyzing the optical parameters of the glasses. The high refractive index of these glasses was due to their large oxygen packing densities and significant electronic polarizabilities of oxygen ions. The substitution of Al2O3 and ZrO2 was effective for the refractive indices and wavelength dispersions. |
| Keywords: | High refractive index Abbe number Titanate glass Containerless processing Electronic polarizability Oxygen packing density |
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