Effect of cluster size on the chemical ordering in nanometer-sized Au-75at%Cu alloy clusters |
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Authors: | H Yasuda H Mori |
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Institution: | 1. Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, Yamadaoka, Suita, Osaka 565, Japan
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Abstract: | The effect of cluster size on the chemical ordering in nanometer(nm)-sized Au-75at%Cu alloy clusters has been studied by means of transmission electron microscopy (TEM). It was found that the chemically disordered high-temperature phase, i.e. solid solution, becomes more stable than the ordered (L12) low-temperature phase even at room temperature when the cluster diameter is reduced below approximately 5 nm. Simulation has revealed that when the lattice of these nm-sized Au-75at%Cu clusters is so soft that the Debye temperature of the clusters is depressed, the order-disorder transition temperature, Tc of nm-sized clusters falls below room temperature. |
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