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On the structure and optical band gap in (Bi2O3)0.2(BaO)x(B2O3)0.8-2x(GeO2)x glasses

H. TICHA1, J. SCHWARZ1, L. TICHY2,3,*

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
  3. Joint Laboratory of Solid State Chemistry of University of Pardubice and Institute of Macromolecular Chemistry of the Academy of Sciences of the Czech Republic v.v.i., Studentska 84, 532 10 Pardubice,

Abstract

New (Bi2O3)0.2(BaO)x(B2O3)0.8-2x(GeO2)x glasses were prepared from pure oxides. The glass transition temperatures decreased from 489 to 460°C with the increase in x from 0.05 to 0.3, simultaneously the coefficient of thermal expansion increased from 7.3 to 9.6 ppm°C-1. The optical band gap was determined in the region 3.84 (x = 0.05) – 3.54 eV for x = 0.3, the coefficient of the temperature dependence of the optical gap for the temperatures between 30 and 250 °C was found in the narrow region 3.3 × 10-4 – 4 × 10-4 eVK-1 and the non-linear refractive index of the studied glasses was estimated from the optical gap values at around 6.9 × 10-11 esu. Possible structural arrangement of the glasses prepared as indicated by Raman spectroscopy was discussed..

Keywords

Oxide glasses, Raman spectroscopy, optical properties.

Submitted at: May 30, 2013
Accepted at: Sept. 18, 2013

Citation

H. TICHA, J. SCHWARZ, L. TICHY, On the structure and optical band gap in (Bi2O3)0.2(BaO)x(B2O3)0.8-2x(GeO2)x glasses, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 9-10, pp. 1020-1025 (2013)