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Size-dependent structural phase transition of face-centered-cubic metal nanowires

Published online by Cambridge University Press:  03 March 2011

F. Ma  and
K.W. Xu
F. Ma
Affiliation:
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
K.W. Xu*
Affiliation:
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: kwxu@mail.xjtu.edu.cn
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Abstract

Taking Au as an example, we have investigated the epitaxial bain paths of 〈001〉 oriented face-centered-cubic metal nanowires. It demonstrates that there are one stable and one metastable phase, having the lattice constant ratio c/a of about 0.6 and 1.0, respectively. Even without any external stimuli, the surface-tension-induced intrinsic stress in the interior may drive the nanowires to phase transform spontaneously for surface-energy minimization. However, this structural transition depends on the feature sizes of the nanowires. Specifically, only when the cross-section areas are reduced to 4.147 nm2 or so can the surface energy and the intrinsic stress satisfy the thermodynamic and kinetic conditions simultaneously.

Keywords

AuNanostructurePhase transformation
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 5 , May 2007 , pp. 1299 - 1305
Copyright
Copyright © Materials Research Society 2007

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