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Structural coherence and ferroelectric order in nanosized multiferroic YMnO_3

机译：纳米多铁性YMnO_3的结构相干性和铁电有序

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摘要

Atomic-scale structure studies involving synchrotron x-ray diffraction (SXRD) and pair distribution function (PDF) analysis on a series of YMnO_3 particles with sizes ranging from 467 ± 42 (bulk) to 10 ± 1 nm are presented. Studies reveal that while the nanoparticles retain most of the characteristics of the layered hexagonal-type structure of the bulk, substantial local atomic displacements arise with diminishing particle size. The displacements lead to a very substantial loss of structural coherence in the particles of size smaller than 100 nm. The displacements mostly affect the yttrium (Y) atoms and to a lesser extent the Mn-O sublattice in YMnO_3. We argue that the increased displacement of Y atoms along the polar c axis of the hexagonal unit cell may result in enhanced local ferroelectric distortions with decreasing particle size. The planar, that is, a- and b-axis direction displacements of Y atoms, however, may interfere with the cooperative ferroelectricity of nanosized YMnO_3, so future efforts to employ YMnO_3 in nanoscale applications should take them into account.
机译：提出了原子尺度结构研究，涉及对一系列YMnO_3颗粒的同步加速器X射线衍射（SXRD）和对分布函数（PDF）分析，尺寸范围为467±42（本体）至10±1 nm。研究表明，尽管纳米颗粒保留了块状六方型结构的大多数特征，但随着粒径的减小，出现了明显的局部原子位移。位移导致尺寸小于100 nm的颗粒的结构相干性大大降低。位移主要影响钇（Y）原子，并在较小程度上影响YMnO_3中的Mn-O亚晶格。我们认为，Y原子沿六边形晶胞的极性c轴增加的位移可能会导致局部铁电畸变增强，而粒径减小。但是，Y原子的平面（即a轴和b轴方向）位移可能会干扰纳米级YMnO_3的协同铁电性，因此将来在纳米级应用中使用YMnO_3的努力应予以考虑。

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  • 来源
    《Physical review》 |2012年第9期|p.094101.1-094101.8|共8页
  • 作者

    S. Tripathi; V. Petkov; S. M. Selbach; K. Bergum; M.-A. Einarsrad; T. Grande; Y. Ren;

  • 作者单位

    Department of Physics, Central Michigan University, Mt. Pleasant, Michigan 48859, USA;

    Department of Physics, Central Michigan University, Mt. Pleasant, Michigan 48859, USA;

    Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway;

    Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway;

    Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway;

    Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway;

    Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA;

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