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On Effect of Spin-Density Wave Parameters on Shape of ^{119}Sn Mössbauer Spectra

100%
Cieślak J., Dubiel S. M.
Acta Physica Polonica A
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1995
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vol. 88
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issue 6
1143-1150
EN
Based on a simple numerical procedure the influence of various para­meters characteristic of spin-density waves on the shape of ^{119}Sn Mössbauer spectra and the related histograms of the Hyperfine field distributions is investigated.
2
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Influence of Quadrupole Interaction on ^{57}Fe Mössbauer Spectra for Samples with Charge- and Spin-Density Waves

100%
Cieślak J., Dubiel S. M.
Acta Physica Polonica A
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1997
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vol. 91
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issue 6
1131-1139
EN
The influence of the quadrupole interaction on the shape of ^{57}Fe Mössbauer spectra expected for samples with charge-density waves andor spindensity waves is investigated. It is shown, by model calculations, that both for the commensurate and for incommensurate charge-density waves andor spin-density waves the shape of ^{57}Fe Mössbauer spectra is sensitive to the value, and for asymmetric spectra, to the sign of quadrupole interaction. This necessitates an inclusion of quadrupole interaction when analyzing the spectra recorded on samples exhibiting charge-density waves andor spin-density waves, and having a symmetry lower than cubic.
3
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Mössbauer-Effect Study of Calciomagnetites

81%
Dubiel S., Cieślak J., Orewczyk J., Jasieńska S.
Acta Physica Polonica A
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1998
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vol. 93
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issue 3
547-561
EN
Ca_{x}Fe_{3-x}O_{4} samples, with x ≤ 0.28 , prepared from α-Fe_{2}O_{3} and CaO by the Bridgman method were investigated by means of ^{57}Fe Mössbauer spectroscopy. Room temperature spectra gave evidence that the samples were multiphase, the calciomagnetite being the dominant phase with a contribution of 73% to 99%, depending on the sample. Analysis of the subspectra associated with the calciomagnetite gave evidence that Ca-ions reside on the tetrahedral (A) sites and have not random distribution. Their presence on those sites causes a reduction of the hyperfine field at Fe nuclei occupying the octahedral positions (B) by 12.3(1.0) kOe per one Ca-ion and a decrease in the average hf field, 〈H_{B}〉/dx, at the rate of 29 kOe/mol% for x ≤ 0.07 and of 387 kOe/mol% for larger x. In addition, a linear correlation between 〈H_{B}〉 and the average isomer shift, 〈I_{B}〉, was revealed to hold. It indicates that addition of Ca-ions into the magnetite causes a decrease in the spin-density and an increase in the charge-density at Fe nuclei occupying the B-sites.
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