Refractive index calculation using the structural properties of La4Ti9O24 glass

A high refractive index of 2.231±0.001 at 1313 nm is achieved in a colorless, transparent spherical La4Ti9O24 glass that was prepared by using an aerodynamic levitation furnace. We also investigate the origin of the high refractive index based on the Lines theory. The physical parameters necessary f...

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Veröffentlicht in:Journal of applied physics 2008-05, Vol.103 (9)
Hauptverfasser: Arai, Yasutomo, Itoh, Keiji, Kohara, Shinji, Yu, Jianding
Format: Artikel
Sprache:eng
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Zusammenfassung:A high refractive index of 2.231±0.001 at 1313 nm is achieved in a colorless, transparent spherical La4Ti9O24 glass that was prepared by using an aerodynamic levitation furnace. We also investigate the origin of the high refractive index based on the Lines theory. The physical parameters necessary for the theoretical calculations are the averaged nearest-neighbor Ti–O and La–O distances that are deduced by neutron and synchrotron x-ray diffraction measurement and the partial molar volumes of TiO2 and LaO1.5 in the glass. The sum of the calculated TiO2 and LaO1.5 susceptibilities provides a La4Ti9O24 glass refractive index of 2.244. This is very close to the experimental refractive index of the glass. In addition, the theoretical calculation results suggest that the oxygen fivefold Ti (TiO5) cluster produces greater susceptibilities than the sixfold Ti (TiO6) cluster in the glass.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2903544