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Lowering of surface melting temperature in atomic clusters with a nearly closed shell structure

机译:降低壳结构接近封闭的原子团簇的表面熔化温度

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摘要

We investigate the interplay of particle number, N, and structural properties of selected clusters with N = 12 up to N=562 by employing Gupta potentials parameterized for Aluminum and extensive Monte Carlo simulations. Our analysis focuses on closed shell structures with extra atoms. The latter can put the cluster under a significant stress and we argue that typically such a strained system exhibits a reduced energy barrier for (surface) diffusion of cluster atoms. Consequently, also its surface melting temperature, T_S, is reduced, so that T_S separates from and actually falls well below the bulk value. The proposed mechanism may be responsible for the suppression of the surface melting temperature observed in recent experiments.
机译:我们通过为铝参数化的古普塔电位和广泛的蒙特卡洛模拟,研究了颗粒数,氮和N = 12至N = 562的选定簇的结构性质之间的相互作用。我们的分析着重于具有额外原子的封闭壳结构。后者可以使团簇承受很大的应力,我们认为通常这样的应变系统对于团簇原子的(表面)扩散表现出降低的能垒。因此,其表面熔化温度T_S也降低了,使得T_S与体积值分开并且实际上降到了体积值以下。所提出的机制可能是抑制最近实验中观察到的表面熔化温度的原因。

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  • 来源
    《Physical review》 |2010年第7期|p.075435.1-075435.8|共8页
  • 作者单位

    Institut fuer Nanotechnologie, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany;

    Institut fuer Theorie der Kondensierten Materie, Universitaet Karlsruhe, D-76128 Karlsruhe, Germany DekaBank Deutsche Girozentrale, 60325 Frankfurt, Germany;

    Institut fuer Theorie der Kondensierten Materie, Universitaet Karlsruhe, D-76128 Karlsruhe, Germany Institut fuer Nanotechnologie, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany;

    Institut fuer Theorie der Kondensierten Materie, Universitaet Karlsruhe, D-76128 Karlsruhe, Germany Department of Physics, Oregon State University, 301 Weniger Hall Corvallis, OR 97331-6507, USA;

    Institut fuer Nanotechnologie, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany;

    Institut fuer Theorie der Kondensierten Materie, Universitaet Karlsruhe, D-76128 Karlsruhe, Germany Institut fuer Nanotechnologie, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    phase transitions in clusters;

    机译:簇中的相变;

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