A Magnetic and Mössbauer Spectral Study of SmFe₁₁Ti, LuFe₁₁Ti, and Their Respective Hydrides


ac Magnetic susceptibility measurements have been carried out on LuFe11Ti and LuFe11TiH and reveal the absence of any spin-reorientation between 4.5 and 293 K. Iron-57 Mössbauer spectral measurements between 4.2 and 295 K have been carried out on SmFe11Ti and LuFe11Ti and their respective hydrides, SmFe11TiH and LuFe11TiH. The Mössbauer spectra have been analyzed with a model that considers both the orientation of the iron magnetic moments and the distribution of titanium atoms in the near neighbor environment of the three crystallographically distinct iron sites. The assignment and the temperature dependence of the hyperfine fields are in complete agreement with the unit cell volume and its expansion upon hydrogenation and with those observed in the related RFe11Ti and RFe11TiH compounds. The site assignments and their temperature dependencies of the isomer shifts are in complete agreement both with the Wigner-Seitz cell volumes of the inequivalent iron sites and the crystallographic changes upon hydrogen insertion.



Keywords and Phrases

Magnetic Measurements; Rare-earth Intermetallic Compounds; Wigner-Seitz Cell; Crystallography; Hydrogenation; Intermetallics; Isomers; Magnetic Anisotropy; Magnetic Moments; Magnetic Susceptibility; Mössbauer Spectroscopy; Samarium Compounds

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Article - Journal

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© 2005 Elsevier, All rights reserved.

Publication Date

01 Feb 2005