Mössbauer study of giant hard magnetic K 2Fe 3(OH) 2(SO 4) 3(H 2O) 2

Kiyoshi Nomura, Tadashi Sugano, Serge Vilminot, Mohamedally Kurmoo, Erno Kuzmann

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

K 2Fe 3(OH) 2(SO 4) 3(H 2O) 2 was prepared by hydrothermal synthesis. The crystal structure is the isomorphous phase of K 2Co 3(OH) 2(SO 4) 3(H 2O) 2. Mössbauer spectra of K 2Fe 3(OH) 2(SO 4) 3(H 2O) 2 were measured at low temperatures between room temperature and 14 K, and the hyperfine interactions were analyzed. The Neel temperature is 39 K. Two paramagnetic Fe 2+ species were observed in the Mössbauer spectrum at room temperature, and Mössbauer spectra measured below 38 K were decomposed into four magnetic subspectra. From the temperature dependence, it is found that the local electron density at each site is largely deviating at low temperatures, which may induce the giant coercivity.

Original languageEnglish
Pages (from-to)53-57
Number of pages5
JournalHyperfine Interactions
Volume208
Issue number1-3
DOIs
Publication statusPublished - Mar 1 2012

Keywords

  • Hard magnet
  • Magnetic material
  • Mössbauer spectra
  • Potassium iron compound

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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