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Melting Of Surface Layers Of Nanoparticles: Landau Model

机译：纳米颗粒表面层的熔化：Landau模型

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摘要

The melting of metal nanoparticles is considered in the framework of the Landau mean-field model. For the definition of the order parameter, the Lindemann criterion is employed. The phenomenological principle, implying that surface layer of nanoparticles can be in metastable states indefinitely, put forward to explain the formation of pseudo-crystalline surface layer. Therefore, the metastable states of bulkcrystal correspond in structure to the stable states of surface layers under relevant conditions. It is shown that all metastable states are classified by values of the order parameters. The critical radii are determined. The present model elucidates that the metastable states of bulk metals are in a direct connection with the structure states of nanoparticles surface layers. The dependency of the Landau phenomenological coefficients on the size of small particles is under consideration. The developed model is appropriate for nanoparticles, nanowires, and thin films. It allows one to account for influence of matrix. The comparison with available experimental data is carried out.
机译：在Landau平均场模型的框架内考虑了金属纳米粒子的熔化。为了定义顺序参数，使用了Lindemann准则。现象学原理暗示了纳米颗粒的表面层可以无限期处于亚稳态，提出了解释伪晶体表面层形成的解释。因此，在相关条件下，体晶的亚稳态在结构上与表面层的稳定状态相对应。可以看出，所有亚稳态都是通过阶跃参数值进行分类的。确定临界半径。本模型阐明了块状金属的亚稳态与纳米颗粒表面层的结构状态直接相关。正在考虑朗道现象学系数对小颗粒尺寸的依赖性。开发的模型适用于纳米粒子，纳米线和薄膜。它允许人们考虑矩阵的影响。与可用的实验数据进行比较。

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