Publikace detail

Raman studies and optical properties of lead-bismuth metaborate glasses

Autoři: Tichá Helena | Knoblochová Kateřina | Tichý Ladislav

Rok: 2008

Druh publikace: článek v odborném periodiku

Název zdroje: Journal of Optoelectronics and Advanced Materials

Název nakladatele: National Institute of Optoelectronics

Místo vydání: Bukurešť

Strana od-do: 2117-2122

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
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 (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.	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 (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.	Borate glasses;Raman spectroscopy;optical properties

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