Charge order superstructure with integer iron valence in Fe2OBO3

M. Angst, P. Khalifah, R. P. Hermann, H. J. Xiang, M. H. Whangbo, V. Varadarajan, J. W. Brill, B. C. Sales, D. Mandrus

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


Solution-grown single crystals of Fe2OBO3 were characterized by specific heat, Mössbauer spectroscopy, and x-ray diffraction. A peak in the specific heat at 340 K indicates the onset of charge order. Evidence for a doubling of the unit cell at low temperature is presented. Combining structural refinement of diffraction data and Mössbauer spectra, domains with diagonal charge order are established. Bond-valence-sum analysis indicates integer valence states of the Fe ions in the charge ordered phase, suggesting Fe2OBO3 is the clearest example of ionic charge order so far.

Original languageEnglish
Article number086403
JournalPhysical Review Letters
Issue number8
StatePublished - Aug 25 2007

ASJC Scopus subject areas

  • Physics and Astronomy (all)


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