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首页> 外文期刊>Journal of Applied Physics >In-situ extended energy-loss fine structure analysis of the solid and liquid phases in sub-micron Al particles
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In-situ extended energy-loss fine structure analysis of the solid and liquid phases in sub-micron Al particles

机译：亚微米Al颗粒中固相和液相的原位扩展能量损失精细结构分析

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摘要

Extended energy-loss fine structure (EXELFS) analysis was used to study the behavior of the nearest-neighbor atomic distance and thermal vibration behavior of pure Al particles heated and cooled through the melting temperature in situ in a transmission electron microscope. The results show that the increase in first nearest-neighbor distance for solid Al with temperature compares reasonably well with calculated values based on thermal expansion and that anharmonic thermal vibrations lead to an asymmetry in the Gaussian shape of radial-distribution function (RDF) peaks with temperature. In addition to thermal disorder, structural disorder also contributes to an increased asymmetry in the RDF peaks in liquid Al. Comparison of the first nearest-neighbor distance change with the inverse volume plasmon energy obtained from a previous study shows that the nearest-neighbor distance does not follow the same hysteresis as the plasmon energy during supercooling of liquid Al. The apparent contraction in the nearest-neighbor distance observed during supercooling is explained as due to the asymmetry in the RDF peaks at high temperatures caused by the thermal vibrations, possibly combined with the formation of local (icosahedral) clusters in the liquid.
机译：扩展的能量损失精细结构（EXELFS）分析用于研究通过透射电子显微镜原位加热和冷却至熔融温度的纯Al颗粒的最邻近原子距离行为和热振动行为。结果表明，固体Al的第一近邻距离随温度的增加与基于热膨胀的计算值相当吻合，并且非谐热振动导致径向分布函数（RDF）峰的高斯形状不对称，且温度。除了热紊乱之外，结构紊乱还导致液体Al中RDF峰的不对称性增加。将第一个最近邻距离变化与先前研究获得的逆体积等离子体激元能量进行比较后发现，在液体Al的过冷过程中，最近邻距离不具有与等离子体激元能量相同的磁滞。在过冷期间观察到的最近邻居距离的明显收缩被解释为由于热振动引起的高温下RDF峰的不对称性，可能与液体中局部（二十面体）团簇的形成有关。

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  • 来源
    《Journal of Applied Physics》 |2011年第10期|p.104905.1-104905.6|共6页
  • 作者

    Prakash Palanisamy; James M. Howe;

  • 作者单位

    Department of Materials Science and Engineering, University of Virginia, 395 McCormick Rd., Charlottesville, Virginia 22904, USA;

    Department of Materials Science and Engineering, University of Virginia, 395 McCormick Rd., Charlottesville, Virginia 22904, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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