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1
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Behavior of Co^{2+} Cations in the Aqueous and Alcoholic Solution of CoCl_2·6H_2O

100%
Petkova P., Nedkov V.
Acta Physica Polonica A
|
2013
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vol. 123
|
issue 2
207-208
EN
We investigated the optical properties of Co^{2+} cations in the aqueous and alcoholic solution of CoCl_2·6H_2O at room temperature. We measured the absorption spectra of these solutions in the spectral region 395-800 nm. The Racah parameters and the exchange integrals of the aqueous complex [Co(H_2O)_6]^{2+} are calculated. The parameters D_{t} and D_{s} are also calculated on the basis of our experimental data. The parameters δ σ and δπ which are connected with the symmetry of this complex are also determined.
2
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Spectroscopic Properties of Cu Doped (80-x)Sb_2O_3-20Li_2O-xMoO_3 Glasses

81%
Petkova P., Touiri H., Soltani M.
Acta Physica Polonica A
|
2013
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vol. 123
|
issue 2
205-206
EN
The antimony oxide as part of the heavy metal oxide glasses is attractive to researchers in recent years. The new antimony oxide glasses have been successfully synthesized using silica crucible in the ternary system for undoped and doped (80-x)Sb_2O_3-20Li_2O-xMoO_3 (x = 20, 30 mol.%) doped with 0.1 mol.% CuO_2. The optical characterization in the visible spectral region has been carried out on the doped glasses. The role of the Jahn-Teller effect in Cu doped glasses is determined and the electron transitions in these cations have been determined.
3
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Urbach's Rule in Undoped and Co Doped (80-x)Sb_2O_3-20Na_2O-xWO_3 Glasses

81%
Petkova P., Soltani M., Petkov S., Nedkov V.
Acta Physica Polonica A
|
2012
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vol. 121
|
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.
4
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Influence of Cu^{2+} and Cu^{3+} Cations on the Optical Properties of Bi_{12}SiO_{20}:Cu

81%
Petkova P., Petkov S., Tacheva J.
Acta Physica Polonica A
|
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.
5
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Physical Characterization of Sb_2O_3-M_2O-MoO_3 (M~= Li,~K) New Glasses

61%
Soltani M., Hamzaoui M., Houhou S., Touiri H., Bediar L., Ghemri A., Petkova P.
Acta Physica Polonica A
|
2013
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vol. 123
|
issue 2
227-229
EN
New heavy metal oxide glasses involving Sb_2O_3 have been investigated. By using classical routes (melting-casting), glasses synthesized in silica crucibles were obtained in the combination of ternary systems Sb_2O_3-M_2CO_3-MoO_3 (M = Li and K). Characteristic temperatures such as glass transition T_{g}, and onset of the crystallization T_{x}, have been measured using differential scanning calorimeter. Ultrasonic velocities were measured by using pulse echo method to determine the elastics parameters, such as elastic modules (E, G, K, L). Other physical properties were measured, such as density and optical transmission window in far infrared spectra using KBr pellets. Influence of composition on these physico-chemical properties is discussed and correlated to the glass structure.
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