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Mössbauer Investigation of Spin Arrangements in Er_{2-x}Ce_xFe_{14}B

100%
Bogacz B., Pędziwiatr A.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1509-1516
EN
It was theoretically postulated earlier that in compounds Er_{2-x}Ce_{x}Fe_{14}B it may be possible to observe not only axial and planar spin arrangements but also a conical one. In order to experimentally verify this hypothesis, ^{57}Fe Mössbauer spectroscopy analysis was used to study the polycrystalline compounds Er_{2-x}Ce_{x}Fe_{14}B in the postulated composition region (x = 1.0, 1.1, 1.2, 1.3) in the wide range of temperatures. The obtained experimental data do not clearly support the suggestion of conical arrangement occurrence in the postulated compositions. They indicate that such phenomenon may be shifted towards higher Ce content.
2
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Mössbauer and Magnetometric Studies of Spin Reorientations in Er_{2-x}Th_xFe_{14}B

81%
Wojciechowska A., Bogacz B., Pędziwiatr A.
Acta Physica Polonica A
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2006
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vol. 109
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issue 3
427-432
EN
The Er_{2-x}Th_xFe_{14}B (x=0.5, 1.0, 1.5) polycrystalline compounds have been investigated with ^{57}Fe Mössbauer spectroscopy in the 50-330 K temperature range and magnetometry in the temperature range of 4.2-340 K. Initial magnetization vs. temperature measurements allowed us to establish the temperature regions of reorientations and also the Curie temperatures of the compounds. The spin reorientation phenomena (changes from planar to axial spin arrangements) have been studied extensively by a narrow step temperature Mössbauer scanning in the vicinity of the spin reorientation temperatures. From the analysis of the obtained Mössbauer spectra it was deduced that in the region of transition each subspectrum was split into two Zeeman sextets, which were characterised by different hyperfine magnetic fields and quadrupole splittings. A consistent way of describing the Mössbauer spectra in the wide range of temperatures was proposed. The composition and temperature dependences of hyperfine interaction parameters and subspectra contributions were derived from experimental spectra. The transition temperatures were determined for all the compounds studied and the spin phase diagram was constructed.
3
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Influence of Carbon on Spin Reorientation Processes in Er_{2-x}R_xFe_{14}C (R~=~Gd, Pr) - Mössbauer and Magnetometric Studies

61%
Pędziwiatr A., Krawiec K., Bogacz B., Kapusta C., Przewoźnik J., Kaczorowski D., Talik E.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
48-51
EN
The Er_{2-x}R_{x}Fe_{14}C (R=Gd, Pr) polycrystalline compounds have been synthesized and investigated with ^{57}Fe Mössbauer spectroscopy and magnetic measurements. The spin reorientation phenomena were studied extensively by narrow step temperature scanning in the neighborhood of the spin reorientation temperature. Obtained Mössbauer spectra were analyzed using a procedure of simultaneous fitting and the transmission integral approach. Consistent description of Mössbauer spectra were obtained, temperature and composition dependencies of hyperfine interaction parameters and subspectra contributions were derived from fits and the transition temperatures were determined for all the compounds studied. Initial magnetization versus temperature measurements (in zero and non-zero external field) for Er_{2-x}Gd_{x}Fe_{14}C compounds allowed to establish the temperature regions of reorientation, change of magnetization value during the transition process. The results obtained with different methods were analyzed and the spin arrangement diagrams were constructed. Data obtained for Er_{2-x}Gd_{x}Fe_{14}C were compared with those for Er_{2-x}Gd_{x}Fe_{14}B series.
4
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Spin Reorientation Studies in Nd_2Fe_{14-x}Si_xB (0

61%
Gargula R., Pędziwiatr A., Bogacz B., Wróbel S., Bartolomé J., Stankiewicz J.
Acta Physica Polonica A
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2002
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vol. 101
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issue 2
289-294
EN
Nd_2Fe_{14-x}Si_xB (x=0.25, 0.5, 0.75, 1.0, 1.5, 2.0) intermetallic compounds were investigated by magnetometry, ^{57}Fe Mössbauer effect, electric resistivity, and differential scanning calorimetry mainly in the vicinity of the spin reorientation temperature, T_{SR}. The Curie temperature, T_C, and T_{SR} were determined for different compositions and the spin phase diagram was constructed. ^{57}Fe Mössbauer spectra showed noticeable changes in the reorientation region. For temperatures above the transition, the spectra were analysed using 6 Zeeman patterns associated with 6 inequivalent crystal sites in Nd_2Fe_{14}B according to site occupations (16k_1:16k_2:8j_1:8j_2:4c:4e). In the transition region, 12 subspectra had to be incorporated in the analysis. Electric resistivity measurements showed a typical metallic behaviour with no anomalies in the magnetic transition region. Differential scanning calorimetry measurements revealed broad endothermic two stage peaks around T_{SR}.
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