Structure determination of ferromagnetic perovskite BiMnO3
Structure determination of ferromagnetic perovskite BiMnO3
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DOI：
10.1006/jssc.1999.8267
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发表时间：
1999-07-01
影响因子：
3.3
通讯作者：
Syono, Y
中科院分区：
文献类型：
--
作者：
Atou, T;Chiba, H;Syono, Y
用电子衍射和中子粉末衍射确定了高压合成的铁磁BiMnO_3的结构。该结构与严重畸变的钙钛矿结构相关，具有单斜对称性，空间群C2，其中a = 9.5323（6）埃，B = 5.6064（3）埃，C = 9.8535（7）埃，并且β = 110.667（5）度。畸变由极化的Ri 6s（2）孤对引起，每个三价锰离子都表现出Jahn-Teller畸变，空d（x2-y2）轨道的有序化对铁磁性起重要作用. (C)北京：科学出版社.
Structure of feromagnetic BiMnO3 synthesized at high pressure has been determined by electron diffraction and neutron powder diffraction. This structure is related to a heavily distorted perovskite structure, having monoclinic symmetry, space group C2, with a = 9.5323(6) Angstrom, b = 5.6064(3) Angstrom, C = 9.8535(7) Angstrom, and beta = 110.667(5)degrees, The distortion is caused by a polarized Ri 6s(2) lone pair, Every trivalent manganese cation reveals the Jahn-Teller distortion and ordering of a vacant d(x2-y2) orbital is suggested to play an important role for the ferromagnetism. (C) 1999 Academic Press.