ISSN:
1434-6079
Keywords:
36.40
;
64.70D
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We have studied the structural, dynamical and thermodynamical behaviour of Pb clusters in theN=147−2057 range, using a phenomenological many-body potential and molecular dynamics. Cuboctahedral structures, previously found to be particularly stable for this system, are used as starting configurations at lowT. Calculated size-dependent melting temperatures appear to be reasonably accounted for by Pawlow's law,T m (N)=T m (∞)−AN −1/3. The behaviour of the mean square displacements and direct structural observations suggest that melting initiates at the surface, in agreement with recent experimental observations. High-frequency surface peaks in the vibrational spectrum disappear asT approachesT m , in coincidence with the onset of surface diffusion.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01425613
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