"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Optical band gap and Raman spectra in AxB0.2-x (TeO2)0.8 glasses

J. OZDANOVA1, H. TICHA1, L. TICHY2,*

Affiliation

  1. Faculty of Chemical Technology, University of Pardubice, 532 10 Pardubice, Czech Republic
  2. Institute of Macromolecular Chemistry of the Academy of Sciences of the Czech Republic v.v.i., Heyrovsky sq. 2, 120 06 Prague, Czech Republic, Present address: Joint Laboratory of Solid State Chemistr

Abstract

Seven different glasses with the molar fraction of TeO2 equal to eighty were prepared from pure oxides. The optical band gap was determined in the region 3.33 - 3.61 eV. The coefficient of the temperature dependence of the optical band gap was found in the region 3.8 × 10-4 - 6.8 × 10-4 eVK-1. From the optical band gap the non-linear refractive index value of the studied glasses was estimated at around 0.85 × 10-11 esu. Reduced Raman scattering spectra indicate structural changes induced, by chemical composition, in TeO2 network due to conversion from TeO4 trigonal bipyramids to TeO3 and TeO3+1 units. A qualitative correlation in TeO4 → TeO3 and TeO3+1 conversion and the optical band gap was found..

Keywords

Tellurite glasses, Optical band gap, Raman scattering.

Submitted at: May 6, 2010
Accepted at: May 26, 2010

Citation

J. OZDANOVA, H. TICHA, L. TICHY, Optical band gap and Raman spectra in AxB0.2-x (TeO2)0.8 glasses, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 5, pp. 1024-1029 (2010)