Neutron powder diffraction study on the crystal and magnetic structures of BiCrO3

Alexei A. Belik, Satoshi Iikubo, Katsuaki Kodama, Naoki Igawa, Shinichi Shamoto, Eiji Takayama-Muromachi

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52 Citations (Scopus)

Abstract

The crystal and magnetic structures of polycrystalline BiCrO3 were determined by the Rietveld method from neutron diffraction data measured at temperatures from 7 to 490 K. BiCrO3 crystallizes in the orthorhombic system above 420 K (space group Pnma; Z = 4; a = 5.54568(12) Å, b = 7.7577(2) Å, and c = 5.42862(12) Å at 490 K) in the GdFeO3-type structure. Below 420 K down to 7 K, a monoclinic structure is stable with C2/c symmetry (a = 9.4641(4) Å, b = 5.4790(2) Å, c = 9.5850(4) Å, and ß= 108.568(3)° at 7 K). A possible model for antiferromagnetic order below TN = 109 K is proposed with a propagation vector of k = (0, 0, 0). In this model, magnetic moments of Cr3+ ions are coupled antiferromagnetically in all directions, forming a G-type antiferromagnetic structure. Refined magnetic moments at 7, 50, and 80 K are 2.55(2)μB, 2.43(2)μB, and 2.09(2)μB, respectively. The structure refinements revealed no deviation from stoichiometry in BiCrO3.

Original languageEnglish
Pages (from-to)3765-3769
Number of pages5
JournalChemistry of Materials
Volume20
Issue number11
DOIs
Publication statusPublished - 2008 Jun 10

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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