## 摘要

The crystal and magnetic structures of polycrystalline BiCrO_{3} were determined by the Rietveld method from neutron diffraction data measured at temperatures from 7 to 490 K. BiCrO_{3} 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 GdFeO_{3}-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 Cr^{3+} 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 BiCrO_{3}.

原文 | English |
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頁（從 - 到） | 3765-3769 |

頁數 | 5 |

期刊 | Chemistry of Materials |

卷 | 20 |

發行號 | 11 |

DOIs | |

出版狀態 | Published - 2008 6月 10 |

## All Science Journal Classification (ASJC) codes

- 化學 (全部)
- 化學工程 (全部)
- 材料化學

## 指紋

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