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首页> 外文期刊>Physical review >Crystal-to-stripe reordering of sodium ions in Na_xCoO_2 (x≥0.75)
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Crystal-to-stripe reordering of sodium ions in Na_xCoO_2 (x≥0.75)

机译:Na_xCoO_2(x≥0.75)中钠离子的晶体到条带重排

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摘要

The sodium reordering in Na_xCoO_2 in the vicinity of room temperature is rationalized at high x in terms of phase transitions between square and striped phases. A striking hexagon-of-hexagons diffraction pattern observed for x=0.78 can be reproduced using coexisting square and striped phases that are related by simple shear deformations. All compositions exhibit a partial melting transition to a disordered stripe phase just below room temperature, which alters the topology of the electrical conduction pathways.
机译:根据方相和带状相之间的相变,在高x下,在室温附近的Na_xCoO_2中钠的重排合理。对于x = 0.78观察到的惊人的六边形六边形衍射图可以通过使用与简单剪切变形相关的正方形和条纹相共存来再现。所有组合物仅在室温以下就显示出部分熔融转变为无序条纹相,这改变了导电路径的拓扑。

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  • 来源
    《Physical review》 |2009年第10期|9-12|共4页
  • 作者单位

    Helmholtz-Zentrum Berlin fuer Materialien und Energie, Lise-Meitner-Campus, Glienicker Strasse 100, D-14109 Berlin, Germany Department of Physics, The University of Liverpool, Liverpool L69 7ZE, United Kingdom;

    Service de Physique de VEtat Condense (CNRS/MIPPU/URA 2464), DSM/IRAMIS/SPEC, CEA Saclay, PC. 135, F-91191 GifSur Yvette, France;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 OQX, United Kingdom;

    Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 OEX, United Kingdom;

    Helmholtz-Zentrum Berlin fuer Materialien und Energie, Lise-Meitner-Campus, Glienicker Strasse 100, D-14109 Berlin, Germany Institut fuer Festkoerperphysik, Technische Universitaet Berlin, Hardenbergstrasse 36, Berlin D-10623, Germany;

    Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom;

    Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom;

    Helmholtz-Zentrum Berlin fuer Materialien und Energie, Lise-Meitner-Campus, Glienicker Strasse 100, D-14109 Berlin, Germany;

    Helmholtz-Zentrum Berlin fuer Materialien und Energie, Lise-Meitner-Campus, Glienicker Strasse 100, D-14109 Berlin, Germany;

    Helmholtz-Zentrum Berlin fuer Materialien und Energie, Lise-Meitner-Campus, Glienicker Strasse 100, D-14109 Berlin, Germany;

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

    crystallographic aspects of phase transformations; pressure effects;

    机译:相变的晶体学方面;压力效应;

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