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Raman studies and optical properties of lead-bismuth metaborate glasses
Authors: Tichá Helena | Knoblochová Kateřina | Tichý Ladislav
Year: 2008
Type of publication: článek v odborném periodiku
Name of source: Journal of Optoelectronics and Advanced Materials
Publisher name: National Institute of Optoelectronics
Place: Bukurešť
Page from-to: 2117-2122
Titles:
Language Name Abstract Keywords
cze Raman studies and optical properties of lead-bismuth metaborate glasses 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 glass-transition 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 (&#947;, [eV/K]) varied from 5.35&#61620;10-4 to 5.91&#61620;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&#61620;10-11 to 5.91&#61620;10-11. Borate glasses;Raman spectroscopy;optical properties
eng Raman studies and optical properties of lead-bismuth metaborate glasses 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 glass-transition 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 (&#947;, [eV/K]) varied from 5.35&#61620;10-4 to 5.91&#61620;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&#61620;10-11 to 5.91&#61620;10-11. Borate glasses;Raman spectroscopy;optical properties

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