Spontaneous alloying of tin atoms into nanometer-sized gold clusters and phase stability in the resultant alloy clusters |
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| Authors: | H Yasuda K Furuya |
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| Institution: | (1) Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan, JP;(2) National Research Institute for Metals, Sakura, Tsukuba, Ibaraki 305-0003, Japan, JP |
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| Abstract: | Alloying behavior and phase stability has been studied in situ by transmission electron microscopy using clusters in the Au-Sn system. When tin atoms are vapor-deposited onto nm-sized
gold clusters, rapid dissolution of tin atoms into gold clusters takes place and as a result Au-rich solid solution, amorphous-like
Au-Sn alloy and AuSn compound clusters are formed depending upon the concentration of tin. The remarkable enhancement of solubility
has been observed in Au-rich solid solution and AuSn compound. It becomes more difficult to form two phases in the interior
of individual clusters even if the composition of alloy clusters falls in the two-phase region in the phase diagram for the
bulk alloy and as a result amorphous-like phase is stabilized in nm-sized Au-Sn alloy clusters.
Received 2 August 1999 and Received in final form 8 November 1999 |
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| Keywords: | PACS 61 16 -d Electron ion and scanning probe microscopy - 36 40 -c Atomic and molecular clusters - 64 70 -p Specific phase transitions |
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