A Magnetic and Mössbauer Spectral Study of HoFe₁₁Ti and HoFe₁₁TiH

Abstract

A.c. susceptibility measurements were carried out between 4.2 and 295 K on HoFe11TiH and reveal a spin-reorientation transition at ~150 K. Iron-57 Mössbauer spectral measurements between 4.2 and 295 K were carried out on both HoFe11 Ti and HoFe11 TiH. The Mössbauer spectra were analyzed with a model which 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 is in complete agreement with both the iron magnetic moments measured by neutron diffraction and the changes expected at the spin-reorientation. The assignment and the temperature dependence of the isomer shifts is in complete agreement both with the crystallographic changes occurring at the spin reorientation and upon hydrogen insertion. The changes in hyperfine field and isomer shift with the number of titanium near neighbors for each of the three iron sites are consistent with the values observed for related titanium-iron intermetallic compounds.

Department(s)

Chemistry

Keywords and Phrases

Crystallography; Isomers; Magnetic Moments; Magnetic Variables Measurement; Mössbauer Spectroscopy; Gas-solid Reactions; Rare Earth Compounds; Hydrogen Absorbing Materials; Magnetic Measurements

International Standard Serial Number (ISSN)

0925-8388

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2003 Elsevier, All rights reserved.

Publication Date

01 Apr 2003

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