Structural properties of a mixed valence compound Fe2 BO4

S. Shimomura, S. Nakamura, N. Ikeda, E. Kaneko, K. Kato, K. Kohn

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


We have performed X-ray powder diffraction measurements in a mixed valence compound of Fe2 BO4 using synchrotron radiation. The diffraction patterns obtained at several temperatures between 85 and 386 K were analyzed by the Rietveld method. The monoclinic-orthorhombic transition, ascribed to charge-ordering of Fe2 + and Fe3 + ions, was confirmed by the temperature dependence of the monoclinic angle β. No superlattice reflection due to the charge-ordering was detected. The temperature dependences of the lattice parameters show anomalies around 270 K as well as the monoclinic-orthorhombic transition temperature of 327-347 K. The structural change around 270 K is attributable to the onset of the partial charge-delocalization.

Original languageEnglish
Pages (from-to)793-795
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Issue number2 SUPPL. PART 1
Publication statusPublished - Mar 2007
Externally publishedYes


  • Charge ordering
  • Fe BO
  • Mixed valence
  • Phase transition
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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