中国物理B ›› 2008, Vol. 17 ›› Issue (9): 3163-3169.doi: 10.1088/1674-1056/17/9/001

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Study of superstructure II in multiferroic BiMnO3

葛炳辉, 李方华, 李雪明, 王玉梅, 迟振华, 靳常青   

  1. Beijing National Laboratory for Condensed Matter Physics,Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2008-07-03 修回日期:2008-07-08 出版日期:2008-09-08 发布日期:2008-09-08
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 50672124) and Ministry of Science and Technology (MOST) of China (Grant Nos 2005CB724402 and 2007CB925003).

Study of superstructure II in multiferroic BiMnO3

Ge Bing-Hui(葛炳辉), Li Fang-Hua(李方华)†, Li Xue-Ming(李雪明), Wang Yu-Mei (王玉梅), Chi Zhen-Hua (迟振华), and Jin Chang-Qing (靳常青)   

  1. Beijing National Laboratory for Condensed Matter Physics,Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2008-07-03 Revised:2008-07-08 Online:2008-09-08 Published:2008-09-08
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 50672124) and Ministry of Science and Technology (MOST) of China (Grant Nos 2005CB724402 and 2007CB925003).

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摘要： The crystal structure of the minor phase, named superstructure II, existing in multiferroic compound BiMnO3 has been studied by electron diffraction and high-resolution transmission electron microscopy. Domains of major and minor phases coexisting in BiMnO3 were observed in high-resolution electron microscope images. The unit cell of minor phase was determined to be triclinic with the size 4\times 4\times 4 times as large as the distorted perovskite subcell. The [111] and [10\bar {1}] projected structure maps of the minor phase have been derived from the corresponding images by means of the image processing. A possible rough three-dimensional (3D) structure model was proposed based on the 3D structural information extracted from the two projected structure maps. Since there is no inversion centre in the proposed model, the minor phase may contribute to the ferroelectric property of BiMnO3.

关键词: multiferroics, BiMnO3, high-resolution transmission electron microscopy, image processing

Abstract: The crystal structure of the minor phase, named superstructure II, existing in multiferroic compound BiMnO3 has been studied by electron diffraction and high-resolution transmission electron microscopy. Domains of major and minor phases coexisting in BiMnO3 were observed in high-resolution electron microscope images. The unit cell of minor phase was determined to be triclinic with the size $4\times 4\times 4$ times as large as the distorted perovskite subcell. The [111] and [10$\bar{1}$] projected structure maps of the minor phase have been derived from the corresponding images by means of the image processing. A possible rough three-dimensional (3D) structure model was proposed based on the 3D structural information extracted from the two projected structure maps. Since there is no inversion centre in the proposed model, the minor phase may contribute to the ferroelectric property of BiMnO3.

Key words: multiferroics, BiMnO3, high-resolution transmission electron microscopy, image processing

中图分类号:  (Inorganic compounds)

  • 61.66.Fn
61.05.J- (Electron diffraction and scattering) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.50.Dd (Nonmetallic ferromagnetic materials) 77.84.-s (Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)