Mössbauer study of permanent-magnet materials: Sm2Fe 17-xAlx compounds

I. A. Al-Omari, S. S. Jaswal, A. S. Fernando, D. J. Sellmyer

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Abstract

The Fe57 Mössbauer spectra of Sm2Fe 17-xAlx, where x=0, 1.0, 2.0, 3.0, and 4.0, have been measured at room temperature and analyzed. The ternary compounds Sm 2Fe17-xAlx have the rhombohedral Th 2Zn17 structure. Mössbauer measurements showed that all the compounds studied were ferromagnetic. The average hyperfine field was found to decrease with the increasing aluminum concentration, which is in qualitative agreement with magnetic measurements. The decrease in the average hyperfine field was from 224 kOe at x=0 to 174 kOe at x=4. By fitting the spectra we found that the hyperfine fields for the iron sites decrease in the order 6c, 9d, 18f, and 18h. The measured average isomer shift relative to α-iron was found to increase linearly with x. Analysis of the spectra showed that Al atoms occupy the 6c, 18h, and 18f, but not 9d, Fe sites and the fraction of occupancy of Al was found to depend on x.

Original languageEnglish
Pages (from-to)6159-6161
Number of pages3
JournalJournal of Applied Physics
Volume76
Issue number10
DOIs
Publication statusPublished - 1994

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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