Neutron powder diffraction study of the crystal and magnetic structures of BiNiO3 at low temperature

Sandra J. E. Carlsson, Masaki Azuma, Yulchl Shimakawa, Miklo Takano, Alan Hewat, J. Paul Attfield

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The crystal and magnetic structures of the charge ordered perovskite BiNiO3 have been studied at temperatures from 5 to 300 K using neutron diffraction. Rietveld analysis of the data shows that the structure remains triclinic (space group P (1) over bar) throughout the whole temperature range. Bond-valence sum calculations based on the Bi-O and Ni 0 bond distances confirm that the charge distribution is Bi0.53+Bi0.55+Ni2+O3 down to 5 K. The magnetic cell is identical to that of the triclinic superstructure and a G-type antiferromagnetic model gives a good fit to the magnetic intensities, with an ordered Ni2+ moment of 1.76(3) mu(B) at 5 K. However, BiNiO3 is ferrimagnetic due to the inexact cancellation of opposing, inequivalent moments in the low symmetry cell. (C) 2008 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)611-615
Number of pages5
JournalJournal of Solid State Chemistry
Issue number3
Publication statusPublished - Mar 2008


  • magnetic structure
  • neutron diffraction
  • perovskite oxides
  • RNIO3 R
  • ND

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