The solid–liquid interfacial free energy of close-packed metals: Hard-spheres and the Turnbull coefficient
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Issue Date
2001-09-01Author
Laird, Brian Bostian
Publisher
American Institute of Physics
Type
Article
Article Version
Scholarly/refereed, publisher version
Metadata
Show full item recordAbstract
Largely due to its role in nucleation and crystal-growth, the free energy of the crystal-melt interfacial free energy is an object of considerable interest across a number of scientific disciplines, especially in the materials-, colloid-, and atmospheric sciences. Over 50 years ago, Turnbull observed that the interfacial free energies (scaled by the mean interfacial area per particle) of a variety of metallic elements exhibit a linear correlation with the enthalpy of fusion. This correlation provides an important empirical “rule-of-thumb” for estimating interfacial free energies, but lacks a compelling physical explanation. In this work we show that the interfacial free energies for close-packed metals are linearly correlated with the melting temperature and are therefore primarily entropic in origin. We also show that the slope of this linear relationship can be determined with quantitative accuracy using a hard-sphere model, and that the correlation with the enthalpy of fusion reported by Turnbull follows as a consequence of the fact that the entropy of fusion for close-packed metals is relatively constant.
Description
This is the publisher's version, also available electronically from http://scitation.aip.org/content/aip/journal/jcp/115/7/10.1063/1.1391481
ISSN
0021-9606Collections
Citation
Laird, Brian Bostian. (2001). "The solid–liquid interfacial free energy of close-packed metals: Hard-spheres and the Turnbull coefficient." The Journal of Chemical Physics, 115(7):2887-2888. http://dx.doi.org/10.1063/1.1391481
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