Refractive index calculation using the structural properties of La4Ti9O24 glass

Abstract

Local structure origin of higher glass forming ability in Ta doped Co65B35 amorphous alloy J. Appl. Phys. 112, 073520 (2012) NMR and conductivity studies of the mixed glass former effect in lithium borophosphate glasses J. Chem. Phys. 137, 124507 (2012) Robust hydrophobic Fe-based amorphous coating by thermal spraying Appl. Phys. Lett. 101, 121603 (2012) Correlating local structure with inhomogeneous elastic deformation in a metallic glass A high refractive index of 2.231Ϯ 0.001 at 1313 nm is achieved in a colorless, transparent spherical La 4 Ti 9 O 24 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 TiO 2 and LaO 1.5 in the glass. The sum of the calculated TiO 2 and LaO 1.5 susceptibilities provides a La 4 Ti 9 O 24 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 ͑TiO 5 ͒ cluster produces greater susceptibilities than the sixfold Ti ͑TiO 6 ͒ cluster in the glass.

Study on optical properties of La2O3–TiO2–Nb2O5 glasses prepared by containerless processing

“…Masuno [5] found that the refractive index of BaTi 2 O 5 glass was 2.15, the Abbe number was 21.5, and the optical transmittance could be measured from 340 nm to 7.7 μm. Arai [17] demonstrated that the colorless and transparent spherical La 4 Ti 9 O 24 glass could be prepared by using an aerodynamic levitation furnace. The refractive index was 2.231 at 1313 nm and the theoretical calculations suggested that five-fold coordinated Ti-O clusters had played an important role in high refractive index.…”

Glass formation of rare earth aluminates by containerless processing

“…Containerless processing enables glass formation of materials with a low glass forming ability because it prevents heterogeneous nucleation from the container walls and thus promotes deeper undercooling of the melt. Some binary systems, such as Al 2 O 3 -based [7,8], TiO 2 -based [9][10][11][12][13], and Nb 2 O 5 -based glasses [14], have been vitrified in bulk form without the use of network-former oxides by utilizing containerless processing.…”

Glass Formation in LaO3/2–TiO2 Binary System by Containerless Processing

“…Consequently, it is useful for vitrifying materials in bulk form with low glass-forming ability. 15 The La 4 Ti 9 O 24 glass consists of~65% TiO 5 and~35% TiO 6 , 16 and it has a refractive index of 2.37 at 589 nm exceeding that of BaTi 2 O 5 . These glasses had unusual characteristic structures and remarkable optical properties.…”