2007/07/18 by Manuel Angst, M. Angst, P. Khalifah +11 · 2 citations
Materials Science · Physics and Astronomy · #Crystal Structures and Properties #Multiferroics and related materials #X-ray Diffraction in Crystallography #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.99.086403
published as Phys. Rev. Lett. 99, 086403 (2007) · 4 pages, 5 figures. Fig. 3 is available in higher resolution from the authors. PRL in print
arxiv created 2007/07/18 · openalex publication_date 2007/08/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Solution-grown single crystals of Fe(2)OBO(3) 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 Fe(2)OBO(3) is the clearest example of ionic charge order so far.