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Melting of superheated crystals initiated on vacancies

机译:空位引发的过热晶体熔化

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摘要

In a large variety of ideal crystals we found that when rapidly migrating atoms squash or annihilate a neighbouring vacancy and produce a disordered cluster, the heat of migration stored in the system exceeds the enthalpy increase required for the coordinating atoms of the vacancy to form a liquid phase, i.e. the liquid phase nucleates from vacancies. Furthermore, volumetric analysis supports this well. This vacancy-decomposition model provides quantitative information on the melting point, the latent heat and the volume change upon melting and hence clarifies the mechanism of melting.
机译:在各种各样的理想晶体中,我们发现当快速迁移的原子挤压或歼灭相邻的空位并产生无序簇时,系统中存储的迁移热超过了空位的配位原子形成液体所需的焓增加。相,即液相从空位成核。此外,体积分析很好地支持了这一点。该空位分解模型提供了有关熔点,潜热和熔化时体积变化的定量信息,因此阐明了熔化机理。

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