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1
Content available remote

Heating-Induced Conversion of Sr-Contaminated Brushite - EXAFS Data Analysis

100%
Rokita E., Łażewski J., Hermes C., Nolting H.-F.
Acta Physica Polonica A
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1994
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vol. 86
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issue 5
767-770
EN
The extended X-ray absorption fine structure method was applied to determine changes of the coordination parameters of Sr atoms during the thermal conversion of Sr-contaminated brushite into calcium pyrophosphate. The results revealed that the changes of the crystallographic structure induced by heating are correlated with the rearrangement of the Sr environment. It was also confirmed that Sr may be used as a marker of Ca in cases of thermal conversions of orthophosphate groups into pyrophosphate groups.
2
Content available remote

Random Microscopic Model of Quaternary Alloys

100%
Konior J., Łażewski J., Kisiel A.
Acta Physica Polonica A
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1997
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vol. 91
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issue 4
815-818
EN
A random model of microscopic structure of zinc-blende type A_{1-x}B_{x}C_{1-y}D_{y} quaternary alloys, based entirely on the elastic bond-stretching and bond-bending forces of two-element components AC, AD, BC, and BD, was constructed. The model was applied to Cd_{1-x}Mn_{x}Te_{1-y}Se_{y} quaternary alloys and the calculated nearest-neighbor distances were compared with the experimental data. Additionally, a possibility of particle exchange (within each sublattice) was included into the model and a possibility of studying the preferential coordination was discussed.
3
Content available remote

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
Content available remote

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.
5
Content available remote

Inelastic X-Ray Scattering Studies of Phonon Dispersion in PbTe and (Pb,Cd)Te Solid Solution

64%
Kuna R., Minikayev R., Trzyna M., Gas K., Bosak A., Szczerbakow A., Petit S., Łażewski J., Szuszkiewicz W.
Acta Physica Polonica A
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2016
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vol. 130
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issue 5
1251-1254
EN
PbTe and its solid solution (Pb,Cd)Te containing 2% of CdTe and PbTe grown by self-selecting vapour growth technique were investigated by inelastic X-ray scattering using synchrotron radiation. The ID28 beamline at ESRF with the incident photon energy of 17794 eV and the energy resolution of 3 meV was applied for that purpose. The measurements were performed at room temperature along [001]-type high symmetry direction in the Brillouin zone. In spite of a very low energy of phonon branches they can be determined by inelastic X-ray scattering with a high accuracy. The transversal acoustic phonon dispersion obtained by inelastic X-ray scattering corresponds well to those resulting from inelastic neutron scattering measurements and ab initio calculations. Apart from expected structures corresponding to the bulk phonons an additional scattering related to the crystal surface properties was observed in the inelastic X-ray scattering spectra. The analysis performed with the use of secondary ion mass spectroscopy technique demonstrated a presence of a thin oxide layer at sample surfaces.
6
Content available remote

Hardening of (Pb,Cd)Te Crystal Lattice with an Increasing CdTe Content in the Solid Solution

64%
Kuna R., Adamiak S., Petit S., Baroni P., Gas K., Minikayev R., Szczerbakow A., Łażewski J., Szuszkiewicz W.
Acta Physica Polonica A
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2016
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vol. 130
|
issue 5
1245-1247
EN
Single crystals of the (Pb,Cd)Te solid solution with CdTe content up to 9% were grown by self-selecting vapour growth method and investigated by powder X-ray diffraction, inelastic neutron scattering, and nanoindentation measurements. The analysis of the linear part of the LA phonon dispersion, determined by the inelastic neutron scattering demonstrated an increase of the sound velocity (thus the hardening of the crystal lattice) with an increase of CdTe content in the solid solution. An important increase of microhardness value for (Pb,Cd)Te was directly confirmed by results of nanoindentation measurements performed for a few samples with various chemical composition.
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