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Optical band gap and Raman spectra in some (Bi2O3)(x)(WO3)(y)(TeO2)(100-x-y) and (PbO)(x)(WO3)(y)(TeO2)(100-x-y) glasses
Authors: Ožďanová Jitka | Tichá Helena | Tichý Ladislav
Year: 2009
Type of publication: článek v odborném periodiku
Name of source: Journal of Non-Crystalline Solids
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 2318-2322
Titles:
Language Name Abstract Keywords
cze Optická šířka zakázaného pásu a Ramanova spektra skelných systémů (Bi2O3)(x)(WO3)(y)(TeO2)(100-x-y) a (PbO)(x)(WO3)(y)(TeO2)(100-x-y) Byla připravena skla systému (Bi2O3)(x)(WO3)(y)(TeO2)(100-x-y) a (PbO)(x)(WO3)(y)(TeO2)(100-x-y). Teplota skelné transformace studovaných skel se pohybuje v oblasti 383-434 ° C, koeficient teplotní roztažnosti je v rozmezí 12-16 ppm/° C a hustota v rozmezí 6.30-6.80 g/cm(3). Z optických měření tenkých vzorků (bublin) byla nalezena oblast optické šířky zakázaného pásu 3.21-3.36 eV. V teplotním intervalu 300-480 K, byly zjištěny hodnoty teplotní koeficienty optického gapu v rozmezí 3.7x10(-4) - 5.24x10(-4) eV/K. Ramanova spektra ukazují na přítomnost WO6 oktaedrů (spojených pomocí rohů) a těchto tří-atomárních spojení: Bi-O-Te, Pb-O-Te and W-O-Te. Ramanova spektroskopie;Heavy-metal oxidy;Optická spektroskopie;Ramanova spektroskopie
eng Optical band gap and Raman spectra in some (Bi2O3)(x)(WO3)(y)(TeO2)(100-x-y) and (PbO)(x)(WO3)(y)(TeO2)(100-x-y) glasses The glasses representing (Bi2O3)(x)(WO3)(y)(TeO2)(100-x-y) and (PbO)(x)(WO3)(y)(TeO2)(100-x-y) systems were prepared. The dilatometric glass-transition temperatures of examined glass samples were found in the region 383-434 degrees C, the coefficient of thermal expansion varied from 12 to 16 ppm/degrees C and the density ranged from 6.30(2) to 6.80(8) g/cm(3). From the optical transmission measurements of thin glassy bulk samples prepared by a glass blowing, the optical gap values were found in the narrow region 3.21-3.36 eV. For the temperature interval 300-480 K, the values of the temperature coefficient of the optical band gap varied from 3.7 x 10(-4) to 5.24 x 10(-4) eV/K. It is suggested that Raman feature observed at around 350 cm(-1) can be assigned to an overlap of Raman bands attributed to WO6 corner shared octahedra and to the following three atomic linkages: Bi-O-Te, Pb-O-Te and W-O-Te. (C) 2009 Elsevier B.V. All rights reserved. Raman scattering;Heavy-metal oxides;Optical spectroscopy;Raman spectroscopy

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