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Raman studies and some physical properties of selected (PbO)x(Nb2O5)y(TeO2)1-x-y glasses
Authors: Ožďanová Jitka | Tichá Helena | Tichý Ladislav
Year: 2010
Type of publication: článek v odborném periodiku
Name of source: Optical Materials
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 950-955
Titles:
Language Name Abstract Keywords
cze Ramanova spektra a některé fyzikální vlastnosti vybraných skel (PbO)x(Nb2O5)y(TeO2)1-x-y Vybraná skla Nb2O5–TeO2, PbO–Nb2O5–TeO2 and PbO–TeO2 byla připravena z oxidů vysoké čistoty. Teplota skelné transformace těchto skel roste z 281 do 411 °C s růstem obsahu Nb2O5 a současně klesá koeficient teplotní roztažnosti z 21 na 11 ppm/°C. Ramanova spektra indikují přítomnost entit TeO4, TeO3+1, TeO3 a NbO6 oktaedrů ve studovaných sklech. Optická šířka zakázaného pásu v oblasti teplot 30 až 250 °C leží v intervalu 3.39 - 3.6 eV a koeficient teplotní závislosti veličiny leží v intervalu 4.1 x 10(-4) - 6.8 x 10(-4) eV/K. Nelineární index lomu u studovaných skel počítaný z hodnot optické šířky zakázaného pásu činí 0.85 x 10-11 esu. Ramanova spektroskopie; Telluritová skla; Optické vlastnosti
eng Raman studies and some physical properties of selected (PbO)x(Nb2O5)y(TeO2)1-x-y glasses Selected Nb2O5–TeO2, PbO–Nb2O5–TeO2 and PbO–TeO2 glasses were prepared from very pure oxides.The glass-transition temperature increased from 281 to 411 °C with an increase in Nb2O5 content and,simultaneously, the coefficient of thermal expansion decreased from 21 to 11 ppm/°C. Raman scattering measurements indicated that TeO4 trigonal bipyramids, TeO3+1, TeO3 trigonal unit and NbO6 octahedra were the basic structural units of Nb2O5–TeO2 and PbO–Nb2O5–TeO2 glasses. The optical band gap was determined in the region 3.39–3.60 eV and the coefficient of the temperature dependence of the optical gap for the temperatures between 30 and 250 °C in the region 4.1 x 10(-4) - 6.8 x 10(-4) eV/K was found. Non-linear refractive index of the studied glasses was estimated from the optical gap values at around 0.85 x 10-11 esu. Raman spectroscopy; Tellurite glasses; Optical properties

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