Melting of superheated crystals initiates on vacancies

Details Melting of superheated crystals initiates on vacancies Melting of superheated crystals initiates on vacancies

2010-07-24

arxiv.org/abs/1007.4258v1

Philosophical Magazine Letters, vol 87, pp19-25, 2007

Physics

Condensed Matter

Materials Science

8pages,3figures

Scientific paper

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.

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