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Journal of Electron Microscopy 51:S215-S218 (2002)
© 2002 Oxford University Press

Full-length paper

Amorphous-like nanostructures stabilized in nanometre-sized alloy clusters

Hidehiro Yasuda1,*, Masaki Takeguchi2, Kazutaka Mitsuishi2, Miyoko Tanaka2, Minghui Song2, Kazuo Furuya2 and Hirotaro Mori3

1Faculty of Engineering, Kobe University, Rokkodai 1-1, Nada, Kobe 657-8501,
2National Institute for Materials Science, Sakura, Tsukuba, Ibaraki 305-0003 and
3Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan

To whom correspondence should be addressed. E-mail: yasuda{at}mech.kobe-u.ac.jp

Nanostructures stabilized in nm-sized alloy clusters have been studied by transmission electron microscopy, using clusters in the Au-Sb and Au-Sn binary systems, in which the composition of alloy clusters falls in the two-phase region in the bulk alloy phase diagram. When the diameters of both Au-Sn and Au-Sb alloy clusters are smaller than several nm, it becomes difficult to form the two obviously different phases in the interior of individual clusters and, consequently, an amorphous-like nanostructure (including an ultra-fine grain structure) appears. It is suggested that the degree of refinement in the amorphous-like nanostructure may be related closely to the stability of the interface of two different phases.

Keywords     TEM, phase equilibria, amorphous materials, surfaces and interfaces


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