Cation distribution and valence state in Mn- Zn ferrite examined by synchrotron X-rays

Syoichi Sakurai, Satoshi Sasaki, Maki Okube, Hiroki Ohara, Takeshi Toyoda

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35 Citations (Scopus)

Abstract

Cation distribution and valence state in manganese zinc ferrite have been investigated with the synchrotron X-rays, where the two-wavelengths anomalous dispersion (TWAD) technique of X-ray diffraction was used at wavelengths of 1.7535 and 1.2934 Å for Fe K and Zn K absorption edges, respectively. The result shows that a single crystal of Mn0.80Zn0.18Fe 2.02O4 grown at T = 1373 K has an inverse-spinel ingredient, where 11% of Mn and 44% of Zn ions occupy the octahedral B sites of spinel ferrite. The cation distribution is quite different from that of manganese zinc ferrite manufactured, which was synthesized at T = 1873 K and has a typical normal-spinel structure. The chemical shifts in Mn K, Zn K and Fe K X-ray absorption near-edge structure (XANES) spectra support that only Mn 2+, Zn2+ and Fe3+ ions exist in the manganese zinc ferrite. From a combination study of XANES and X-ray magnetic circular dichroism (XMCD) spectroscopy at the Mn K edge, it is suggested that Mn 2+ ions occupy both tetrahedral A and octahedral B sites. The chemical formula determined in this study is described as (Mn 0.712+Zn0.102+Fe0.19 3+) [Mn0.092+Zn0.08 2+Fe1.833+]O4.

Original languageEnglish
Pages (from-to)3589-3595
Number of pages7
JournalPhysica B: Condensed Matter
Volume403
Issue number19-20
DOIs
Publication statusPublished - 2008 Oct 1

Keywords

  • Anomalous dispersion
  • Cation distribution
  • Mn-Zn ferrite
  • Resonant X-ray scattering
  • Site occupancy
  • Valence state

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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