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

被引：57

作者：

Belik, Alexei A. ^{[1
]}

Iikubo, Satoshi ^{[2
]}

Kodama, Katsuaki ^{[2
]}

Igawa, Naoki ^{[2
]}

Shamoto, Shinichi ^{[2
]}

Takayama-Muromachi, Eiji ^{[1
]}

机构：

[1] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton MANA, Tsukuba, Ibaraki 3050044, Japan

[2] Japan Atom Energy Agcy, Quantum Beam Sci Directorate, Ibaraki 3191195, Japan

来源：

CHEMISTRY OF MATERIALS | 2008年 / 20卷 / 11期

关键词：

D O I：

10.1021/cm800375d

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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) angstrom, b = 7.7577(2) angstrom, and c = 5.42862(12) angstrom 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) angstrom, b = 5.4790(2) angstrom, c = 9.5850(4) angstrom, and P = 108.568(3)degrees 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)mu(B), 2.43(2)mu(B), and 2.09(2)mu(B), respectively. The structure refinements revealed no deviation from stoichiometry in BiCrO3.

引用

页码：3765 / 3769

页数：5

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