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In situ High-resolution Electron Microscope Observation of Phase Change in Nanometer-sized Alloy Particles

Published online by Cambridge University Press:  01 July 2005

Jung-Goo Lee ,
Hirotaro Mori  and
Hidehiro Yasuda
Jung-Goo Lee*
Affiliation:
Research Center for Ultra High Voltage Electron Microscopy, Osaka University, Suita, Osaka 565-0871, Japan
Hirotaro Mori
Affiliation:
Research Center for Ultra High Voltage Electron Microscopy, Osaka University, Suita, Osaka 565-0871, Japan
Hidehiro Yasuda
Affiliation:
Department of Mechanical Engineering, Kobe University, Nada, Kobe 657-8501, Japan
*
a)Address all correspondence to this author. e-mail: jg-lee@uhvem.osaka-u.ac.jp
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Abstract

From the study of alloy phase formation in nanometer-sized particles by in situ transmission electron microscopy, it is revealed that not only the surface energy but also the interface energy of an interface between two different phases (solid–solid or solid–liquid) significantly changes the phase equilibrium of nanometer-sized particles. These energies result in large suppression of the eutectic point, structural instability, and unique solid/liquid two-phase structures in isolated nanometer-sized alloy particles. A theoretical study based on thermodynamics, which is modified in such a manner that Gibbs free energies for bulk materials were modified by taking factors affecting the phase equilibrium of nanometer-sized alloy particles into consideration, was proved useful to evaluate the results obtained from experiments.

Keywords

NanoparticlePhase transformationTransmission electron microscopy (TEM)
Type
Reviews
Information
Journal of Materials Research , Volume 20 , Issue 7 , July 2005 , pp. 1708 - 1721
Copyright
Copyright © Materials Research Society 2005

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