Mössbauer spectrum of high-pressure synthesized ilmenite-type FeGeO3

T. Fujii, D. Nakatsuka, M. Nakanishi, J. Takada, T. Yoshino

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Ilmenite-type FeGeO3 was prepared by high-pressure synthesis technique using a Kawai-type multi-anvil apparatus at 23.5 GPa and 500 °C. The effects of post annealing on the high-pressure synthesized samples were investigated by XRD analysis, Mössbauer spectroscopy and SQUID-magnetization measurements. The subsequent annealing after the high-pressure synthesis was effective to improve the crystallinity and increased the crystallite size of the ilmenite-type FeGeO3. The room temperature Mössbauer spectrum was composed of sharp paramagnetic doublets assigned to Fe2+. The well-crystallized ilmenite-type FeGeO3 showed typical antiferromagnetic behavior with the Néel temperature of 79 K, while the as-prepared sample without annealing demonstrated the superparamagnetic characteristics with larger magnetization.

Original languageEnglish
Pages (from-to)275-280
Number of pages6
JournalHyperfine Interactions
Volume226
Issue number1-3
DOIs
Publication statusPublished - Apr 2014

Keywords

  • Antiferromagnetism
  • High-pressure synthesis
  • Mössbauer spectroscopy

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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