Article (Scientific journals)
A magnetic and Mossbauer spectral study of TbFe11Ti and TbFe11TiH
Piquer, C.; Hermann, Raphaël; Grandjean, François-Xavier et al.
2003In Journal of Physics: Condensed Matter, 15 (43), p. 7395-7409
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Abstract :
[en] Magnetic and iron-57 Mossbauer spectral measurements between 4.2 and 640 K have been carried out on TbFe11Ti and TbFe11TiH. The insertion of hydrogen into TbFe11Ti form TbFe11TiH increases its ordering temperature, magnetization, magnetic hyperfine fields, and isomer shifts as a result of lattice expansion. Further, the insertion of hydrogen reinforces the basal magnetic anisotropy of the terbium sublattice and, as is shown by ac susceptibility measurements and thermomagnetic analysis, the spin reorientation observed in TbFe11Ti at 338 K disappears in TbFe11TiH. The Mossbauer spectra have been analysed with a model that considers both the easy magnetization direction and the distribution of titanium atoms in the near-neighbour environment of the three crystallographically distinct iron sites. The assignment and the temperature dependencies of the hyperfine fields and isomer shifts are in complete agreement with a Wigner-Seitz cell analysis of the three iron sites in RFe11Ti and RFe11TiH, where R is a rare-earth element. A complete analysis of the quadrupole interactions in both magnetic phases and in the paramagnetic phase of TbFe11Ti supports the Mossbauer spectral analysis, and indicates that in the basal magnetic phase the iron magnetic moments are oriented along the equivalent [100] and [010] directions of the unit cell.
Disciplines :
Physics
Author, co-author :
Piquer, C.
Hermann, Raphaël ;  Université de Liège - ULiège > Département de physique > Département de physique
Grandjean, François-Xavier ;  Centre Hospitalier Universitaire de Liège - CHU > Imagerie médicale
Isnard, O.
Long, G. J.
Language :
English
Title :
A magnetic and Mossbauer spectral study of TbFe11Ti and TbFe11TiH
Publication date :
2003
Journal title :
Journal of Physics: Condensed Matter
ISSN :
0953-8984
eISSN :
1361-648X
Publisher :
Institute of Physics, Bristol, United Kingdom
Volume :
15
Issue :
43
Pages :
7395-7409
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 19 October 2011

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