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Phase-Change Materials: Vibrational Softening upon Crystallization and Its Impact on Thermal Properties

机译：相变材料：结晶时的振动软化及其对热性能的影响

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摘要

Crystallization of an amorphous solid is usually accompanied by a significant change of transport properties, such as an increase in thermal and electrical conductivity. This fact underlines the importance of crystalline order for the transport of charge and heat. Phase-change materials, however, reveal a remarkably low thermal conductivity in the crystalline state. The small change in this conductivity upon crystallization points to unique lattice properties. The present investigation reveals that the thermal properties of the amorphous and crystalline state of phase-change materials show remarkable differences such as higher thermal displacements and a more pronounced anharmonic behavior in the crystalline phase. These findings are related to the change of bonding upon crystallization, which leads to an increase of the sound velocity and a softening of the optical phonon modes at the same time.
机译：无定形固体的结晶通常伴随着传输性质的显着变化，例如导热性和电导率的增加。这一事实强调了晶体顺序对于电荷和热量传输的重要性。然而，相变材料在结晶状态下显示出显着低的热导率。结晶时该电导率的小变化表明独特的晶格性质。本研究表明，相变材料的非晶态和结晶态的热性能显示出显着的差异，例如较高的热位移和结晶相中更明显的非谐行为。这些发现与结晶时键的变化有关，这导致声速的增加和光学声子模的同时变软。

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  • 来源
    《Advanced Functional Materials》 |2011年第12期|p.2232-2239|共8页
  • 作者

    Toshiyuki Matsunaga; Noboru Yamada; Rie Kojima; Shinichi Shamoto; Masugu Sato; Hajime Tanida; Tomoya Uruga; Shinji Kohara; Masaki Takata; Peter Zalden; Gunnar Bruns; llya Sergueev; Hans Christian Wille; Raphal Pierre Hermann; Matthias Wuttig;

  • 作者单位

    Panasonic Corporation 3-1-1 Yagumo-Nakamachi, Moriguchi, Osaka 570-8501, Japan;

    Panasonic Corporation;

    Digital &. Network Technology Development Centre Panasonic Corporation Osaka, Japan;

    Neutron Science Research Centre Japan Atomic Energy Research Institute Ibaraki, Japan;

    Japan Synchrotron Radiation Research Institute Hyogo, Japan;

    Japan Synchrotron Radiation Research Institute Hyogo, Japan;

    Japan Synchrotron Radiation Research Institute Hyogo, Japan;

    Japan Synchrotron Radiation Research Institute Hyogo, Japan;

    Department of Advanced Materials Science School of Frontier Sciences The University of Tokyo Chiba, Japan;

    Panasonic Corporation 3-1-1 Yagumo-Nakamachi, Moriguchi, Osaka 570-8501, Japan;

    Panasonic Corporation 3-1-1 Yagumo-Nakamachi, Moriguchi, Osaka 570-8501, Japan;

    European Synchrotron Radiation Facility 38043 Grenoble, France;

    Deutsches Elektronen-Synchrotron 22607 Hamburg, Germany;

    Inv. Prof, Julich Centre for Neutron Science JCNS and Peter Griinberg Institut PGI JARA-FIT, Forschungszentrum Julich GmbH, 52425 Julich, Germany Faculte des Sciences Universite de Liege 4000 Liege, Belgium;

    Panasonic Corporation 3-1-1 Yagumo-Nakamachi, Moriguchi, Osaka 570-8501, Japan;

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