TEM studies on RMnO3 multiferroic materials

Q. H. Zhang, L. J. Wang, X. K. Wei, S. D. Guo, B. H. Ge, P. Chen, L. Gu, A. Hirata, M. W. Chen, C. Q. Jin, B. G. Liu, Y. Yao, Y. G. Wang, X. F. Duan, R. C. Yu

研究成果: Conference contribution

抄録

(I) Using state-of-the-art aberration-corrected annular-bright-field (ABF) and high-angle annular-dark-field (HAADF) scanning transmission electron microscopy (STEM), we investigated domain wall structures in multiferroic hexagonal TmMnO3 and LuMnO3 ceramics at atomic scale. Two types of 180 degree domain walls (DWs), i.e. the transverse and the longitudinal DWs (TDWs and LDWs) with uniform displacements of a/3 and 2a/3, respectively, were identified along b direction, which is in consistency with the interlock between ferroelectric and structural translation domain wall predicted previously. (II) Using electron beam as the excitation source to explore the structural evolution of YMnO3, a new phase has been identified under the radiation of electron beam in the transmission electron microscope. Analyses on the electron energy loss spectra reveal that this phase originates from ordered oxygen-vacancy. The first principles calculation was applied to pick out the optimized stable structure with a lower polarization. Analyses of density of states indicate that weak Y-O covalency is favorable for the existence of ferroelectricity, supporting the electrostatic nature of ferroelectricity in the YMnO3-related system.

本文言語English
ホスト出版物のタイトル8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8
出版社John Wiley and Sons Inc.
ページ3347-3354
ページ数8
ISBN(印刷版)9781632660008
DOI
出版ステータスPublished - 2013
外部発表はい
イベント8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8 - Waikoloa, HI, United States
継続期間: 2013 8 42013 8 9

出版物シリーズ

名前8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8
4

Other

Other8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8
国/地域United States
CityWaikoloa, HI
Period13/8/413/8/9

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料

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