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.
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Ma, F., Xu, K.W. Size-dependent structural phase transition of face-centered-cubic metal nanowires. Journal of Materials Research 22, 1299–1305 (2007). https://doi.org/10.1557/jmr.2007.0153
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DOI: https://doi.org/10.1557/jmr.2007.0153