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1
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Reflectivity Spectra of Cd_{1-x}Mn_{x}F_{2} in the 5-35 eV Energy Range

100%
Francini R., Zimnal-Starnawska M., Zema N., Orłowski B.
Acta Physica Polonica A
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1991
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vol. 80
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issue 3
453-456
EN
The reflectivity spectra of Cd_{1-x}Mn_{x}F_{2} crystals, in the 5-35 eV energy range at 300 and 77 K, were investigated. The observed changes in the shape of spectra, caused by increase of the Mn content, are compared with the calculated band structure of pure CdF_{2} and with the already available results of XPS experiments for these crystals. The increasing concentration of Mn results in the blurring of the reflectivity structures and shifts the energy of direct exciton (as compared to pure CdF_{2}). Qualitative arguments (hybridization of Mn^{2+} 3d and F^{-} 2p states) can describe these effects but a quantitative explanation would require a detailed band structure calculation for these compounds.
2
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Liquid Nitrogen and Room Temperature Reflectivity Spectra of Cd_{1-x}Fe_{x}Se in the 0.5-6.0 eV Energy Range

100%
Dębowska D., Zimnal-Starnawska M., Kisiel A., Giriat W.
Acta Physica Polonica A
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1994
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vol. 86
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issue 6
1015-1020
EN
The reflectivity measurements for mixed crystals Cd_{1-x}Fe_{x}Se (0.00 ≤ x ≤ 0.10) have been carried out in an energy range of 0.5-6.0 eV at 300 and 77 K. The influence of Fe^{2+}(3d^{6}) states on the changes in the energy positions of the reflectivity maxima E_{0}, E_{1}(A_{1}), E_{1}(A_{2}), and E_{1}(B) is analyzed and the obtained results are consistent with the models existing in the literature.
3
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Manganese Distribution in CdMnTeSe Crystals. EXAFS Data Analysis

88%
Kisiel A., Łażewski J., Zimnal-Starnawska M., Burattini E., Mycielski A.
Acta Physica Polonica A
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1996
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vol. 90
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issue 5
1032-1034
EN
The extended X-ray absorption fine structure (EXAFS) technique has been used to investigate the first shell coordination in zinc-blende quaternary Cd_{1-x}Mn_{x}Te_{1-y}Se_{y} (0.0 ≤ x ≤ 0.15; 0.0 ≤ y ≤ 0.20) alloys. The experimental data have been collected with the use of synchrotron radiation. All the nearest-neighbour distances have been found as linearly dependent on Se and Mn concentration. For each composition a consistent deviation from full random distribution of Mn atoms around Se and Te atoms was observed. Possible reasons of preferential Mn-Se over Mn-Te pairing were discussed.
4
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Vacuum Ultraviolet Reflectivity of Cd_{1-x}Fe_{x}Te

76%
Dębowska D., Zimnal-Starnawska M., Kisiel A., Piacentini M., Zema N., Giriat W.
Acta Physica Polonica A
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1992
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vol. 82
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issue 2
341-347
EN
Reflectivity spectra for mixed crystals Cd_{1-x}Fe_{x}Te with 0.00 ≤ x ≤0.05 were investigated. The measurements were carried out in the energy range 6.0-30.0 eV at 300 K. The influence of Fe^{2+}(3d^{6}) states on the changes in the energy positions of the reflectivity maxima E'_{1} , E'_{1} + ∆, c, d, e, f, h and i is analysed. The obtained results confirm the band structure diagrams published previously.
5
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Room and Liquid Nitrogen Temperature Reflectivity Spectra of Co,Se Mixed Crystals

76%
Dębowska D., Zimnal-Starnawska M., Kisiel A., Piacentini M., Zema N., Lama F., Giriat W.
Acta Physica Polonica A
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1995
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vol. 87
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issue 1
275-278
EN
The optical properties of the semiconducting compounds Zn_{1-x}Co_{x}Se crystallizing in the zinc-blende structure have been investigated. The reflectivity spectra of these materials for different concentration of Co ions, have been taken out in a wide energy range between 4 and 25 eV at room (RT) and liquid nitrogen temperature (LNT) using synchrotron radiation from ADONE Storage Ring in Frascati. The comparisons between the reflectivity spectra of ternary systems and host crystal ZnSe are made. On the basis of the experimental and theoretical results, the changes of the structures of the reflectivity spectra of host crystal ZnSe caused by the influence of transition metal ions are discussed.
6
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Liquid Nitrogen Temperature Reflectivity Spectra of Zn_{1-x}Mn_{x}Se and Zn_{1-y}Fe_{y}Se Mixed Crystals

76%
Zimnal-Starnawska M., Dębowska D., Kisiel A., Piacentini M., Lama F., Zema N., Giriat W.
Acta Physica Polonica A
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1994
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vol. 86
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issue 5
869-874
EN
The liquid nitrogen temperature reflectivity spectra of the tetrahedral diluted magnetic semiconductors (DMS's) Zn_{1-y}Fe_{y}Se and Zn_{1-x}Mn_{x}Se crystallizing in the zinc-blende structure were investigated. The reflectivity measurements for different concentration of Fe (y = 0.01, 0.05, and 0.10) and Mn (x = 0.10 and 0.30) ions were taken out in a wide energy range between 4 and 30 eV using synchrotron radiation from ADONE storage ring in Frascati. The average resolution ΔE/E used for these measurements was better than 1 × 10^{-3} over the entire spectral range. The single crystals were cleaved, before being mounted inside the reflectometer, from the samples grown by the Bridgman method. The comparison between the reflectivity spectra of ternary systems and host crystal ZnSe is made. The changes of the structures of reflectivity spectra of host crystal ZnSe caused by the influence of Fe and Mn ions are discussed.
7
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EXAFS Studies of Zn_{1-x}Mn_{x}S Ternary Compounds

76%
Zimnal-Starnawska M., Łażewski J., Kisiel A., Boscherini F., Pascareli S., Giriat W.
Acta Physica Polonica A
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1994
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vol. 86
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issue 5
763-766
EN
We performed extended X-ray absorption fine structure (EXAFS) measurements of Zn_{1-x}Mn_{x}S solid solution for various concentrations x in the range of 0 ≤ x ≤ 0.4. Data were collected on Zn and Mn K-edges with the use of synchrotron radiation from the ADONE storage ring in Frascati utilizing the Si(111) channel-cut monochromator. Applying the usual procedure of data reduction described elsewhere, we found well-defined different nearest-neighbor Zn-S and Mn-S distances, according to the previous results, almost independent on x. For Mn-S distances in the range of 0.1 ≤ x ≤ 1.0 we found, within the limit of experimental error, a constant value equal to 2.430±0.008 Å. For Zn-S distances for concentration changing from x = 0.0 to x = 0.4 we observed a weak, linear increase from 2.343±0.008 Å to 2.354 ± 0.008 Å, respectively.
8
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Electronic Structure of Zinc-Blende Zn_{0.5}V_{0.5}Se: Theoretical Study

64%
Markowski R., Hołda A., Dębowska D., Kisiel A., Zimnal-Starnawska M., Piacentini M., Zema N., Lama F.
Acta Physica Polonica A
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1995
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vol. 88
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issue 5
1023-1027
EN
In this paper we present a comprehensive study of electronic structure of Zn_{0.5}V_{0.5}Se from the theoretical point of view. Partial and total density of states for spin-polarized antiferromagnetic phase of Zn_{0.5}V_{0.5}Se as well as schematic layouts of the bands have been obtained using the ab initio self-consistent semirelativistic linear muffin-tin orbital method.
9
Content available remote

Electronic Structure of Zinc-Blende Zn_{0.5}Co_{0.5}Se: Theoretical Study

64%
Hołda A., Markowski R., Dębowska D., Kisiel A., Zimnal-Starnawska M., Piacentini M., Zema N., Lama F.
Acta Physica Polonica A
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1996
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vol. 90
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issue 4
817-820
EN
In this paper we present partial densities of states for spin-polarized antiferromagnetic phase of Zn_{0.5}Co_{0.5}Se as well as schematic layouts of the bands, obtained using the ab initio self-consistent semi-relativistic linear muffin tin orbital method. We also present, from theoretical point of view, the analysis of influence of the transition metal cobalt on the electronic structure of a pure ZnSe.
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