Magnetic and Mössbauer spectral properties of DyFe 11 Ti and DyFe 11 TiH

Citation data:

Journal of Magnetism and Magnetic Materials, ISSN: 0304-8853, Vol: 265, Issue: 2, Page: 156-166

Publication Year:
2003
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Readers 4
Citations 17
Citation Indexes 17
Repository URL:
http://scholarsmine.mst.edu/chem_facwork/890
DOI:
10.1016/s0304-8853(03)00245-2
Author(s):
Piquer, Cristina; Isnard, Olivier; Grandjean, Fernande; Long, Gary J.
Publisher(s):
Elsevier BV; Elsevier
Tags:
Materials Science; Physics and Astronomy; Crystallography; Isomers; Magnetic Anisotropy; Magnetic Moments; Magnetization; Mössbauer Spectroscopy; Magnetic Phases; Dysprosium Compounds; Magnetic Susceptibility; Mössbauer Spectra; Rare Earth Compounds; Crystallography; Isomers; Magnetic Anisotropy; Magnetic Moments; Magnetization; Mössbauer Spectroscopy; Magnetic Phases; Dysprosium Compounds; Magnetic Susceptibility; Mössbauer Spectra; Rare Earth Compounds; Chemistry
article description
The temperature dependence of the AC magnetic susceptibility, between 4.2 and 300 K, and the magnetization, between 300 and 600 K, has been measured for DyFe 11 Ti and DyFe 11 TiH. Iron-57 Mössbauer spectral measurements between 4.2 and 295 K have also been carried out on DyFe 11 Ti and DyFe 11 TiH and analyzed with a model which considers both the direction of the magnetization in the different magnetic phases of these compounds and the distribution of titanium atoms in the near-neighbor environment of the three crystallographically distinct iron sites. The magnetic measurements and the Mössbauer spectra of DyFe 11 Ti clearly show the influence of the two spin reorientations occurring in this compound and indicate that the iron magnetic moments are oriented along the [1 0 0] direction of the basal plane below 100 K. The magnetic measurements and the Mössbauer spectra of DyFe 11 TiH do not show any evidence for spin reorientations and are consistent with a basal magnetic anisotropy between 4.2 and 600 K. Hence, the hydrogen insertion into DyFe 11 Ti reinforces the dysprosium magnetic anisotropy. The assignment and the temperature dependencies of the Mössbauer spectral hyperfine fields and isomer shifts are in full agreement with a Wigner–Seitz cell analysis of the three iron sites in DyFe 11 Ti and DyFe 11 TiH.