An Analysis of the Mössbauer Spectral Hyperfine Parameters of RFe₁₁Ti and RFe₁₁TiH, Where R Is a Rare-Earth Element

Author

Cristina Piquer
Fernande Grandjean, Missouri University of Science and TechnologyFollow
Olivier Isnard
Gary J. Long, Missouri University of Science and TechnologyFollow

Abstract

The Mössbauer spectra of CeFe₁₁Ti and CeFe₁₁TiH obtained between 4.2 and 295 K are analysed in terms of the model used to analyse the spectra of the RFe₁₁Ti and RFe₁₁TiH 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 RFe₁₁Ti and RFe₁₁TiH compounds are described with a two-sublattice model in which the iron sublattice contributions coincide with the fields observed in LuFe ₁₁Ti and LuFe₁₁TiH, 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 RFe₁₁Ti 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.

Recommended Citation

C. Piquer et al., "An Analysis of the Mössbauer Spectral Hyperfine Parameters of RFe₁₁Ti and RFe₁₁TiH, Where R Is a Rare-Earth Element," Journal of Physics: Condensed Matter, vol. 18, no. 1, pp. 205 - 219, Institute of Physics - IOP Publishing, Jan 2006.

The definitive version is available at https://doi.org/10.1088/0953-8984/18/1/015

Department(s)

Chemistry

Sponsor(s)

French National Center for Scientific Research
National Science Foundation of Belgium
Belgium. Ministry of the French Speaking Community
National Science Foundation (U.S.)
University of Li`ege

Keywords and Phrases

Isomers; Magnetic Anisotropy; Magnetization; Mathematical Models; Mössbauer Spectroscopy; Hyperfine Parameters; Rare Earth Atomic Numbers; Rare-earth Sublattice; Rare Earth Elements

International Standard Serial Number (ISSN)

0953-8984

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2006 Institute of Physics - IOP Publishing, All rights reserved.

Publication Date

01 Jan 2006