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Raman studies and optical properties of lead-bismuth metaborate glasses

H. TICHA1,* , K. KNOBLOCHOVA1, L. TICHY2

Affiliation

  1. Faculty of Chemical Technology, University of Pardubice, 532 10 Pardubice, Czech Republic
  2. Joint Laboratory of Solid State Chemistry of Institute of Macromolecular Chemistry of the Academy of Sciences of the Czech Republic and University of Pardubice, 532 10 Pardubice, Czech Republic

Abstract

Four (PbO)x(Bi2O3)0.5-x(B2O3)0.5 metaborate glasses, where x = 0.1, 0.2, 0.3 and 0.4 were prepared. The dilatometric glasstransition temperature was found to be practically invariant to x, while both the density and the molar volume increased with substitution of PbO by Bi2O3. Raman spectra indicated that substitution of PbO by Bi2O3 shifted most probably the dynamical equilibrium between metaborate triangles and tetrahedra in direction of metaborate triangles formation. An increase in the Bi2O3 content enhanced relative intensity of the Raman scattering for the wavenumbers from 200 to 500 cm- 1. The optical gap (Eg) was found in the region 3.41 (x = 0.1) < Eg [eV] < 3.63 (x = 0.4) and the coefficient of its temperature dependence (γ, [eV/K]) varied from 5.35×10-4 to 5.91×10-4. The non-linear refractive index (n2, [esu]) estimated from the optical gap values was found slightly increasing with Bi2O3 content from 5.35×10-11 to 5.91×10-11..

Keywords

Borate glasses, Raman spectroscopy, Optical properties.

Submitted at: April 4, 2008
Accepted at: July 10, 2008

Citation

H. TICHA, K. KNOBLOCHOVA, L. TICHY, Raman studies and optical properties of lead-bismuth metaborate glasses, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 8, pp. 2117-2122 (2008)