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首页> 外文期刊>Physical review >Acute and obtuse rhombohedrons in the local structures of relaxor ferroelectric Pb(Mg_(1/3)Nb_(2/3))O_3
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Acute and obtuse rhombohedrons in the local structures of relaxor ferroelectric Pb(Mg_(1/3)Nb_(2/3))O_3

机译:弛豫铁电性Pb(Mg_(1/3)Nb_(2/3))O_3局部结构中的急性和钝性菱面体

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摘要

The local structures around Nb and Pb in the prototypical relaxor ferroelectric Pb(Mg_(1/3)Nb_(2/3))O_3 (PMN) were investigated by x-ray fluorescence holography. The separate atomic images of nearest Pb around Nb revealed acute and obtuse rhombohedral structures of the crystal unit cells. The Pb-Pb correlated images showed a local structure of body-center-like 2a_0 × 2a_0 × 2a_0 superlattice, proving a rigid three-dimensional network structural model combining the two kinds of rhombohedrons. The Pb atoms in the networks are positionally stable, while the other Pb atoms are fluctuating. This superstructure and the fluctuating Pb and Nb atoms are believed to play an important role in the relaxor behavior of PMN at the atomic level.
机译:通过X射线荧光全息术研究了典型弛豫铁电体Pb(Mg_(1/3)Nb_(2/3))O_3(PMN)中Nb和Pb周围的局部结构。 Nb附近最接近的Pb的独立原子图像显示了晶体晶胞的锐角和钝角菱形结构。 Pb-Pb相关图像显示出像体心一样的2a_0×2a_0×2a_0超晶格的局部结构,证明了结合两种菱形体的刚性三维网络结构模型。网络中的Pb原子位置稳定,而其他Pb原子则在波动。据信这种上层结构以及波动的Pb和Nb原子在PMN原子级的弛豫行为中起着重要作用。

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  • 来源
    《Physical review》 |2014年第14期|140103.1-140103.5|共5页
  • 作者单位

    Quantum Beam Science Directorate, Japan Atomic Energy Agency, 1-1-1 Koto, Sayo, Hyogo 679-5148, Japan;

    Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;

    Quantum Beam Science Directorate, Japan Atomic Energy Agency, 1-1-1 Koto, Sayo, Hyogo 679-5148, Japan;

    Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China;

    Graduate School of Information Sciences, Hiroshima City University, Hiroshima 731-3194, Japan;

    Department of Physics, Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan;

    Quantum Beam Science Directorate, Japan Atomic Energy Agency, 1-1-1 Koto, Sayo, Hyogo 679-5148, Japan;

    Department of Chemistry and 4D LABS, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6;

    Department of Chemistry and 4D LABS, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    domain structure; hysteresis;

    机译:域结构;磁滞现象;

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