Cation distribution in ultrafine cadmium ferrite particles determined by X-ray diffraction

Masaru Yokoyama, Tetsuya Sato, Eiji Ohta, Toshihiko Sato

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Cation distribution, oxygen parameter and thermal parameter for bulk material and fine particles of CdFe2O4 were determined by X-ray powder diffraction based on the relation between ln(Iobs/Ical) and sin2θ/λ2, where Iobs is the observed intensity, Ical is the calculated intensity, θ is the Bragg angle, and λ is the X-ray wavelength. The occupancy of Fe3+ ions at the A-sites is 0.06 and 0.13 for bulk material and fine particles with a size of ∼7 or ∼8 nm, respectively. The cluster consisting of small number of Fe3+ ions at the B-sites are formed around a Fe3+ ion at the A-site through the A-B interactions. The oxygen parameters of the fine particles with size of ∼7 and ∼8 nm and the bulk material are 0.385, 0.389 and 0.391, respectively. The thermal parameters of the fine particles are approximately eighty times larger than that of the bulk material. The enhanced thermal parameter can be explained in terms of the softening on the surface.

Original languageEnglish
Pages (from-to)111-115
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume44
Issue number1
DOIs
Publication statusPublished - 1997 Jan

Keywords

  • Cation distribution
  • CdFeO
  • Magnetic cluster
  • Ultra-fine particles

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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