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On the optical band gap in certain ternary phosphate and TeO2 based glasses

H. TICHA1, 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. Present address: Joint Laboratory of Solid State Chemistry of Institute of Macromolecular Chemistry of the Academy of Sciences of the Czech Republic v.v.i. and the University of Pardubice, 532 10 Pard

Abstract

An emphasis is placed on the fact that the correct determination of the optical band gap using the Tauc or Davis- Mott model requires the use of the correct samples thickness for the optical transmission measurements. For 46 heavy metal oxide glasses based on P2O5 or TeO2 the optical band gap values were determined using the Davis – Mott model from the classical optical absorption measurements on the samples with the thickness varying from 0.5 to 4 μm. For PbO-ZnO-P2O5 glasses and for heavy metal oxide glasses based on TeO2 the band gaps in the regions 4.6-5.39 eV and 3.14-3.61 eV, respectively, were found. Using the simplest version of the alloying model the band gaps for glasses PbO-ZnO-P2O5 in the region 4.11-5.78 eV and for heavy metal oxide glasses based on TeO2 in the region 3.02-3.75 eV were calculated..

Keywords

Optical band gap, Heavy metal oxide glasses.

Citation

H. TICHA, L. TICHY, On the optical band gap in certain ternary phosphate and TeO2 based glasses, Optoelectronics and Advanced Materials - Rapid Communications, 5, 12, December 2011, pp.1277-1281 (2011).

Submitted at: Nov. 10, 2011

Accepted at: Nov. 24, 2011