| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Enhanced Surface Premelting of Ni90Si10 Nanoparticles |
| LÜ Yong-Jun** |
| School of Physics, Beijing Institute of Technology, Beijing 100081 |
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| Cite this article: |
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LÜ, Yong-Jun 2012 Chin. Phys. Lett. 29 046401 |
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Abstract Molecular dynamics simulations are used to investigate the melting of Ni90Si10 nanoparticles. The melting is found to originate from the surface prematurely. By means of the bond order parameter, the thickness of the surface liquid layer during surface premelting is calculated. The results show that the thickness of the liquid layer increases in a logarithmic−type manner on heating to the melting temperature, which is larger than the values of elemental Ni nanoparticles. Furthermore, the temperature range associated with the premelting of Ni90Si10 nanoparticles is wider. Both theory and simulations indicate that the high Si concentration of the surface liquid layer formed via surface segregation during crystallization due to Gibbs adsorption is the main reason for enhanced surface premelting. The simulations suggest that the crystallization process used to prepare samples greatly influences the melting behavior of nanoparticles.
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Received: 12 October 2011
Published: 04 April 2012
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| PACS: |
64.70.D-
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(Solid-liquid transitions)
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64.70.kd
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(Metals and alloys)
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65.80.-g
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(Thermal properties of small particles, nanocrystals, nanotubes, and other related systems)
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68.08.De
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(Liquid-solid interface structure: measurements and simulations)
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