An analysis of the hyperfine parameters of the RFeTi and RFeTiH compounds, where R is a rare-earth element

Citation data:

Journal of Physics Condensed Matter, ISSN: 0953-8984, Vol: 18, Issue: 1, Page: 205-219

Publication Year:
2006
Usage 2
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Citations 10
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Repository URL:
http://scholarsmine.mst.edu/chem_facwork/119; https://works.bepress.com/gary-long/91
DOI:
10.1088/0953-8984/18/1/015
Author(s):
Piquer, Cristina; Grandjean, Fernande; Isnard, Olivier; Long, Gary J.
Publisher(s):
IOP Publishing; Institute of Physics - IOP Publishing
Tags:
Materials Science; Physics and Astronomy; Isomers; Magnetic Anisotropy; Magnetization; Mathematical Models; Mössbauer Spectroscopy; Hyperfine Parameters; Rare Earth Atomic Numbers; Rare-earth Sublattice; Rare Earth Elements; Isomers; Magnetic Anisotropy; Magnetization; Mathematical Models; Mössbauer Spectroscopy; Hyperfine Parameters; Rare Earth Atomic Numbers; Rare-earth Sublattice; Rare Earth Elements; Chemistry
article description
The Mössbauer spectra of CeFeTi and CeFeTiH obtained between 4.2 and 295 K are analysed in terms of the model used to analyse the spectra of the RFeTi and RFeTiH compounds, where R is Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er and Lu. The hyperfine parameters obtained with a consistent model that considers both the easy magnetization direction and the titanium preferential site occupancy are discussed as a function of rare-earth atomic number, temperature and hydrogen content. The average hyperfine fields in the RFeTi and RFeTiH compounds are described with a two-sublattice model in which the iron sublattice contributions coincide with the fields observed in LuFe Ti and LuFeTiH, respectively. In both series, the rare-earth sublattice contributes a transferred field which occurs as a result of indirect exchange between the rare-earth 4f and iron 3d electrons and depends on the nature of the rare-earth element. The increase in average hyperfine field and isomer shift upon hydrogenation of the RFeTi compounds results from the unit-cell expansion upon hydride formation. The observed average quadrupole shift is closely related to the magnetic anisotropy exhibited by each compound.