Sol-gel synthesis and dilute magnetism of nano MgO powder doped with Fe

Kiyoshi Nomura*, Souichirou Taya, Atsushi Okazawa, Norimichi Kojima

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Mg oxides doped with 1 % 57Fe were prepared by a sol-gel method, and annealed at various temperatures. Nano-size Mg oxides were characterized by Mössbauer spectrometry, magnetization and XRD measurements. The crystalline size of MgO increases with increase of annealing temperature. Samples annealed at 600 °C and 800 °C gave only doublet peaks of paramagnetic Fe3+ in Mössbauer spectra although Fe3+ doping into MgO induced a distorted structure and showed weak ferromagnetism. It is considered that the magnetic property is due to defect induced magnetism by doping Fe3+ into MgO. For a sample heated at 1000 °C, it is found from low temperature Mössbauer spectra that Fe3+ species are located at the core and shell of fine MgFe2O4 grains and diluted in MgO matrix.

Original languageEnglish
Pages (from-to)161-169
Number of pages9
JournalHyperfine Interactions
Volume226
Issue number1-3
DOIs
Publication statusPublished - 2014 Apr
Externally publishedYes

Keywords

  • dilute magnetism
  • Mg ferrite nano powder
  • MgO doped with Fe
  • Mössbauer

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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