Mössbauer study of the SmFe 2 hydride through 149Sm and 57Fe

Ryo Masuda, Takaya Mitsui, Keiji Itoh, Yasuhiro Kobayashi, Shinji Kitao, Makoto Seto

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We have applied the nuclear resonant forward scattering of synchrotron radiation by 149Sm and 57Fe Mössbauer spectroscopy to SmFe 2 and c-SmFe 2H x (x ≳ 3), to study the effect of hydrogen absorption on local electronic states. The averages of the parameters of the hyperfine structure of SmFe 2 and c-SmFe 2H x at 20K are as follows: the electric quadrupole splitting parameters of 149Sm are -10.3 ± 0.3 and -8.3 ± 0.3 mm/s, the magnetic hyperfine fields of 149Sm are 299 ± 8 and 326 ± 8 T, the isomer shifts of 57Fe are 0.07 ± 0.03 and 0.41 ± 0.03 mm/s, the electric quadrupole splitting parameters of 57Fe are 0 and 0.15 ± 0.03 mm/s, and the magnetic hyperfine fields of 57Fe are 20.4 ± 0.1 and 19.3 ± 0.1 T, respectively. The differences in these parameters between SmFe 2 and c-SmFe 2H x are discussed in connection with the modulation of local electronic states induced by lattice expansion and chemical effect of hydrogenation. The differences also imply the screening of interactions between Sm and Fe by inserted hydrogen atoms.

Original languageEnglish
Article number034714
Journaljournal of the physical society of japan
Volume81
Issue number3
DOIs
Publication statusPublished - Mar 2012

Keywords

  • Fe Mössbauer spectroscopy
  • Hydrogen absorption
  • Interstitial hydride
  • Nuclear resonant scattering of synchrotron radiation by Sm
  • SmFe

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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