Abstract
The phase equilibrium in nanometer (nm)-sized Sb-Au alloy clusters has been studied by means of analytical transmission electron microscopy using an electron probe of approximately 1 nm in diameter. When the cluster size is reduced below approximately 10 nm in mean diameter, the solid solubility of gold (or antimony) increases significantly in antimony (or gold) clusters, compared to that for the corresponding bulk material. For example, the solid solubility of antimony in approximately 7 nm-sized gold clusters amounts to at least 15 at%Sb, which is much higher than that in bulk gold (i.e., almost zero solubility). Such remarkable enhancement of solubility has been observed also in intermetallic compound AuSb 2 .
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