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Size Dependence of Surface Thermodynamic Parameters of Microclusters and the Location of the Gibbs' “Surface of Tension”
Author(s) -
Vogelsberger W.,
Fritsche H.G.,
Müller E.
Publication year - 1988
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221480113
Subject(s) - surface tension , surface stress , surface (topology) , thermodynamics , cluster (spacecraft) , position (finance) , gibbs isotherm , icosahedral symmetry , chemistry , materials science , surface energy , physics , mathematics , crystallography , geometry , finance , programming language , computer science , economics
The thermodynamic surface parameters surface stress and surface tension are calculated for icosahedral and cuboctahedral microclusters in dependence on cluster size. Analytical expressions can be obtained. The size dependent behaviour of these expressions is strongly influenced by the position of the surface to which the surface parameters are referred. If the “equimolecular dividing surface” is used the expected decrease of the values of the surface parameters with decreasing cluster size is observed. The location of the Gibbs' “surface of tension” for these clusters is determined. The thermodynamic equilibrium conditions, the equations of Young‐Laplace and of Kelvin, are formulated with emphasize to the importance of the location of the dividing surface.