Article (Scientific journals)
A Structural, Magnetic, and Mössbauer Spectral Study of the TbCo4-xFexB Compounds with x = 0 to 2
Isnard, Olivier; Mayot, Herve; Grandjean, Fernande et al.
2009In Journal of Applied Physics, 105, p. 113908
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Keywords :
Magnetic properties; Mossbauer spectroscopy; neutron diffraction
Abstract :
[en] The TbCo4–xFexB compounds with x = 0, 1, and 2, have been investigated by x-ray and neutron diffraction, magnetic measurements, and iron-57 Mössbauer spectroscopy. The substitution of cobalt by iron induces both an anisotropic increase in the unit cell volume and a large increase of ca. 250 K in the Curie temperature; the 4.2 K magnetization decreases continuously with increasing iron content. The powder neutron diffraction patterns and the Mössbauer spectra of the TbCo4–xFexB compounds reveal a strong preferential substitution of iron for cobalt on the 2c site, small transition metal magnetic moments of ca. 1.7 µB, and small iron hyperfine fields of ca. 16 T. The compensation temperature of the TbCo4–xFexB compounds decreases continuously from 400 to 350 K between x = 0 and 2 as the result of an iron induced increase in the transition metal magnetization. The magnetic moment and hyperfine field are found to be larger on the 2c site than on the 6i site, a difference that reflects the strong hybridization of the 3d orbitals of the 6i site transition metal with the boron 2p orbitals.
Disciplines :
Physics
Author, co-author :
Isnard, Olivier
Mayot, Herve
Grandjean, Fernande ;  Université de Liège - ULiège > Département de physique > Département de physique
Long, Gary J.;  Missouri University of Science and Technology > Chemistry
Language :
English
Title :
A Structural, Magnetic, and Mössbauer Spectral Study of the TbCo4-xFexB Compounds with x = 0 to 2
Publication date :
2009
Journal title :
Journal of Applied Physics
ISSN :
0021-8979
eISSN :
1089-7550
Publisher :
American Institute of Physics, Melville, United States - New York
Volume :
105
Pages :
113908
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 August 2010

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