A Comparative Mössbauer Spectral Study of the Electronic and Magnetic Properties of Nd₆Fe₁₃Ag and Nd₆Fe₁₃AgH₁₃

Abstract

The Mössbauer spectra of Nd6Fe13Ag and Nd6Fe13AgH13 have been measured between 85 and 295 K and analyzed with a model that takes into account the basal magnetic anisotropy, the iron and hydrogen near-neighbor environments of the five crystallographically and magnetically inequivalent 4d, 16k, 16k', 16l1, and 16l2 iron sites in the former and the six crystallographically and magnetically inequivalent 4d, 16k, 16k', 16l1, 16l2-1 and 16l2-2 iron sites in the latter, where the additional site results from a predominance of hydrogen as near-neighbors on the iron 16l2 site. The increases in hyperfine field and isomer shift observed upon hydrogenation are in agreement with the increase in Wigner-Seitz cell volumes of each site and the changes in the near-neighbor environments.

Department(s)

Chemistry

Keywords and Phrases

Hard Magnetic Materials; Hydrogen Storage Materials; Hyperfine Particles; Magnetic Spin Orientation; Crystal Structure; Hydrogenation; Intermetallics; Isomers; Magnetic Anisotropy; Mössbauer Spectroscopy; Neodymium Compounds; X Ray Crystallography; Magnetic Materials

International Standard Serial Number (ISSN)

0925-8388

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2005 Elsevier, All rights reserved.

Publication Date

01 Feb 2005

Link to Full Text

Share

 
COinS