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

doi:10.1021/cm800375d

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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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 T_N = 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)μ_B, 2.43(2)μ_B, and 2.09(2)μ_B, respectively. The structure refinements revealed no deviation from stoichiometry in BiCrO₃.

Original language	English
Pages (from-to)	3765-3769
Number of pages	5
Journal	Chemistry of Materials
Volume	20
Issue number	11
DOIs	https://doi.org/10.1021/cm800375d
Publication status	Published - Jun 10 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

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@article{67c7b2c0284b40a79d9b9c9ef8230d3a,

title = "Neutron powder diffraction study on the crystal and magnetic structures of BiCrO3",

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) {\AA}, b = 7.7577(2) {\AA}, and c = 5.42862(12) {\AA} 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) {\AA}, b = 5.4790(2) {\AA}, c = 9.5850(4) {\AA}, 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.",

author = "Belik, {Alexei A.} and Satoshi Iikubo and Katsuaki Kodama and Naoki Igawa and Shinichi Shamoto and Eiji Takayama-Muromachi",

year = "2008",

month = jun,

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doi = "10.1021/cm800375d",

language = "English",

volume = "20",

pages = "3765--3769",

journal = "Chemistry of Materials",

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T1 - Neutron powder diffraction study on the crystal and magnetic structures of BiCrO3

AU - Belik, Alexei A.

AU - Iikubo, Satoshi

AU - Kodama, Katsuaki

AU - Igawa, Naoki

AU - Shamoto, Shinichi

AU - Takayama-Muromachi, Eiji

PY - 2008/6/10

Y1 - 2008/6/10

N2 - 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.

AB - 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.

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

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