Compositional dependence of refractive index in tellurite glasses

S. Akamine, T. Nanba, Y. Miura, S. Sakida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The influence of molar volume, polarizability of oxide ion, and Ols binding energy on the refractive index was investigated for the various binary tellurite glasses. In the combination with P2O5, B 2O3, and Al2O3, the refractive index was linearly correlated to molar volume, polarizability, and Ols binding energy. In alkali tellurite systems, the refractive index was weakly related to molar volume and polarizability. A linear correlation was found between the refractive index and Ols binding energy, but the correlation was opposite to the case for P2O5, B2O3, and Al 2O3. It was commonly confirmed in the tellurite glasses that the refractive index was dominantly dependent on the optical band gap. Ab-initio molecular orbital calculations revealed that the LUMO levels were characterized by the structural units in tellurite glasses. In TeO4 tbp unit, the LUMO levels were formed by the anti-bonding overlaps of Te5p and O2p orbitals in the axial Te-O bonds, resulting in the narrow HOMO-LUMO gap. In TeO3+1 unit, larger contribution of Te5p orbital was confirmed in the LUMO levels, resulting in the wider gap. It was finally concluded that the structural change from TeO4 tbp to TeO3 tp via TeO 3+1 units widened the energy gap, resulting in the decrease in the refractive index.

Original languageEnglish
Title of host publicationAdvances in Glass and Optical Materials II - Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology
Pages45-52
Number of pages8
Publication statusPublished - Dec 1 2006
Event6th Pacific Rim Conference on Ceramic and Glass Technology - Maui, Hawaii, United States
Duration: Sep 11 2005Sep 16 2005

Publication series

NameCeramic Transactions
Volume197
ISSN (Print)1042-1122

Other

Other6th Pacific Rim Conference on Ceramic and Glass Technology
CountryUnited States
CityMaui, Hawaii
Period9/11/059/16/05

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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