Surface-stress-induced phase transformation in metal nanowires
| Autor: | Jiankuai Diao, Martin L. Dunn, Ken Gall |
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| Rok vydání: | 2003 |
| Předmět: |
Models
Molecular Electric Wiring Materials science Macromolecular Substances Surface Properties Molecular Conformation Nanowire Crystal structure law.invention Stress (mechanics) Motion law Phase (matter) Materials Testing Ultimate tensile strength Nanotechnology Computer Simulation General Materials Science Crystallization Composite material Crystallography Mechanical Engineering Surface stress General Chemistry Condensed Matter Physics Compressive strength Energy Transfer Models Chemical Mechanics of Materials Gold Stress Mechanical |
| Zdroj: | Nature Materials. 2:656-660 |
| ISSN: | 1476-4660 1476-1122 |
| DOI: | 10.1038/nmat977 |
| Popis: | Several researchers have demonstrated, through experiments and analysis, that the structure and properties of nanometre-scale materials can be quite different to those of bulk materials due to the effect of surfaces. Here we use atomistic simulations to study a surface-stress-induced phase transformation in gold nanowires. The emergence of the transformation is controlled by wire size, initial orientation, boundary conditions, temperature and initial cross-sectional shape. For a100initial crystal orientation and wire cross-sectional area below 4 nm(2), surface stresses alone cause gold nanowires to transform from a face-centred-cubic structure to a body-centred-tetragonal structure. The transformation occurs roughly when the compressive stress caused by tensile surface-stress components in the length direction exceeds the compressive stress required to transform bulk gold to its higher energy metastable crystal structure. |
| Databáze: | OpenAIRE |
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