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The Mössbauer Spectroscopy and Analytical Investigations οf the Polycrystalline Compounds with General Formula Zn_xSn_yCr_zSe_4

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Jendrzejewska I., Hanc A., Zajdel P., Kita A., Goryczka T., Maciążek E., Mrzigod J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1591-1597
EN
We present combined X-ray powder diffraction and Mössbauer ^{119}Sn studies of polycrystalline compounds with a general formula Zn_xSn_yCr_zSe_4 (where x+y+z ≈3). The obtained single-phase compounds crystallize in the spinel cubic structure - Fd3m. Tin ions are found to occupy both tetrahedral and octahedral sublattices. On the contrary to the strong tetrahedral site preference energy of Sn, the presented data strongly suggest that the increase in lattice parameters with Sn doping is caused by Sn ions that incorporated into octahedral positions. A quadrupole and isomer shifts of ^{119}Sn in (SnSe_4)^{6-} and (SnSe_6)^{4-} are also reported.
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A Study of Point Defects in the B2-Phase Region of the Fe-Al System by Mössbauer Spectroscopy

100%
Hanc A., Kansy J., Dercz G., Pająk L., Oleszak D., Mrzigod J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1555-1562
EN
In this work, we employed the Mössbauer spectroscopy and X-ray powder diffraction in a study of point defect formation in intermetallic phases of the B2 structure of the Fe-Al system as a function of Al concentration. The results are compared with the concentrations of point defect determined from positron annihilation data. In the Mössbauer effect, two types of samples are investigated: Fe-Al alloys with few additives obtained by induction melting and Al-rich metallic powders produced by the self-decomposition method and intensive grinding of high energy in the electro-magneto-mechanical mill. We present the values of the ^{57}Fe isomer shift and quadrupole splitting for the components describing the point defect in the local environment of a Mössbauer nuclide. The concentration of the Fe vacancies and Fe atoms substituting Al (Fe-AS) are determined. The results showed that an increase in Al content causes an increase in vacancy and Fe-AS concentration.
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The Mössbauer and X-Ray Studies οf the Spinel Ferrites Cu_{0.5}Fe_{0.5}Cr_2Se_4 and Cu_{0.2}Fe_{0.8}Cr_2Se_4 Prepared by the Ceramic Method

100%
Maciążek E., Hanc A., Sitko R., Zawisza B., Jendrzejewska I., Mrzigod J.
Acta Physica Polonica A
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2008
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vol. 114
|
issue 6
1599-1603
EN
Seleno-spinels with nominal chemical composition Cu_{0.5}Fe_{0.5}Cr_2Se_4 and Cu_{0.2}Fe_{0.8}Cr_2Se_4 were prepared as polycrystalline samples using ceramic method. The assumed composition was verified by wavelength-dispersive X-ray fluorescence spectrometry. The X-ray analysis was carried out in order to make phase analysis and to compare its results with those obtained with the Mössbauer spectroscopy.
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