Abstract
The structural dependence of crystal-melt interfacial free energies $(\ensuremath{\gamma})$ is investigated for fcc and bcc solids through molecular-dynamics calculations employing interatomic potentials for Fe. We compute $\ensuremath{\approx}30--35%$ lower values of $\ensuremath{\gamma}$ for the bcc structure, and find that our results cannot be explained simply in terms of differences in latent heats (L) or densities $(\ensuremath{\rho})$ for bulk bcc and fcc phases. We observe a strong structural dependence of the Turnbull coefficient $\ensuremath{\alpha}=\ensuremath{\gamma}/L{\ensuremath{\rho}}^{2/3},$ and find a trend towards lower crystalline anisotropies of $\ensuremath{\gamma}$ for the bcc structure relative to fcc.
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