Journal
SURFACE SCIENCE
Volume 532, Issue -, Pages 623-627Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0039-6028(03)00470-9
Keywords
surface thermodynamics (including phase transitions); surface melting; surface stress; wetting; aluminum; molecular dynamics
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We investigate the effects of strain on a crystal surface close to the bulk melting temperature T-m, where surface melting usually sets in. Strain lowers the bulk melting point, so that at a fixed temperature below but close to T-m the thickness of the quasi-liquid film is expected to grow with strain, irrespective of sign. In addition, a strain-induced solid surface free energy increase/decrease takes place, favoring/disfavoring surface melting depending on the sign of strain relative to surface stress. In the latter case one can produce a strain-induced prewetting transition, where for increasing temperature the liquid film suddenly jumps from zero to a finite thickness. This phenomenology is illustrated by a realistic molecular dynamics simulation of strained Al(l 10). (C) 2003 Elsevier Science B.V. All rights reserved.
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