The conditions for the equilibrium shape of a second-phase particle nucleating either at a planar interface or at a spherically curved interface are reviewed under the assumption that the interfacial structure of the nucleation site has a torque of an appropriate strength. The results are then incorporated into the modified Gibbs-Wulff construction in order to demonstrate a graphical representation of both the equilibrium shape and the free energy barrier for heterogeneous nucleation.
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The authors are indebted to Prof. H. I. Aaronson of Carnegie Mellon for valuable suggestions on this work. The U.S. Dept. of Energy has financially supported this work under Grant No. DE-FG02-87ER45315, for which the authors express their gratitude.
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Lee, J.K., Choy, J.H. & Choi, Y. The Modified Gibbs-Wulff Construction and Critical Nucleus Morphology at an Interface. MRS Online Proceedings Library 230, 121–128 (1992). https://doi.org/10.1557/PROC-230-121