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

Research output: Contribution to journalArticlepeer-review

Abstract

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
Volume181
Issue number3
DOIs
Publication statusPublished - Mar 2008

Keywords

  • magnetic structure
  • neutron diffraction
  • perovskite oxides
  • METAL-INSULATOR-TRANSITION
  • PHYSICAL-PROPERTIES
  • RNIO3 R
  • ND

Cite this