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Spin Reorientation Studies in Nd_2Fe_{14-x}Si_xB (0

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Gargula R., Pędziwiatr A., Bogacz B., Wróbel S., Bartolomé J., Stankiewicz J.
Acta Physica Polonica A
|
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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