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Urbach's Rule in Undoped and Co Doped (80-x)Sb_2O_3-20Na_2O-xWO_3 Glasses

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Petkova P., Soltani M., Petkov S., Nedkov V.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
152-154
EN
We have analyzed the Co influence on the absorption spectra of (80-x)Sb_2O_3-20Na_2O-xWO_3 glasses in the Urbach rule region at room temperature. We present the comparison between Co and WO_3 manifestation in the spectral region 2.64-3.14 eV. The spectral characteristics of "crystalline" and "glassy" Urbach's rule are also calculated.
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Influence of Cu^{2+} and Cu^{3+} Cations on the Optical Properties of Bi_{12}SiO_{20}:Cu

100%
Petkova P., Petkov S., Tacheva J.
Acta Physica Polonica A
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2012
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vol. 121
|
issue 1
149-151
EN
The absorption spectrum of Bi_{12}SiO_{20}:Cu is measured in the spectral region 0.195-2.95 eV. The validity of the Urbach rule (2.08-2.95 eV) has been also verified. The photochromic effect of these samples in far IR region is investigated. The energy level diagram of Cu^{3+} cations in Bi-octahedrons is presented.
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