Volume 76, Number 4, November 2006
|Page(s)||623 - 629|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||18 October 2006|
Influence of boundaries on high-pressure melting experiments
Physics Department, Technion-Israel Institute of Technology - Haifa, 32000 Israel
Accepted: 25 September 2006
At low pressure, free surfaces play a crucial role in the melting transition, but to maintain pressure, the sample surface must be acted upon by some pressure-transmitting medium. To examine the effect of this medium on melting, we performed Monte Carlo simulations of a system of argon atoms in the form of a slab with upper and lower boundaries. We examined two cases: one with a soft and the other with a rigid medium at the boundaries. We found that in the presence of a rigid medium, melting resembles the mechanical lattice instability found in a surface-free solid. With a soft medium at the boundary, melting begins at the surface and at a lower temperature. The relevance of these results to experiment is discussed.
PACS: 64.70.Dv – Solid-liquid transitions / 62.50.+p – High-pressure and shock wave effects in solids and liquids / 82.20.Wt – Computational modeling; simulation
© EDP Sciences, 2006
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