Abstract
In nanometric systems the surface energy plays a significant role. A thermodynamic model for two alloy-phase particles that includes the surface energy, surface stress and adsorption is formulated and implemented on the solid state equilibrium of the Bi–Sn isolated nanoparticles. Three distinctive features of the phase diagram of nanoparticles that were found in the experiment, are explained in this model: (a) Mutual increase of solubility of both end members with decreasing particle size, (b) solubility limits and existence limits of a single phase are split in nanoparticles and (c) there are different solubility limit curves for different average compositions, together they form solubility line-bands.
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