Abstract
Relative values of the anisotropic surface free energy of several metallic powders have been obtained by examining the crystallography of ultrafine particles ( < 100 nm in size). The material is produced by direct condensation of vapours in an inert gas plasma reactor. Crystallographic characterization of individual powders was accomplished using convergent beam diffraction patterns (CBDP). Accurate analysis utilized the intense Kikuchi lines in the CBDP. The majority of the particles had assumed their equilibrium-facetted morphologies as predicted by the Wulff construction. In this paper, the morphology of the powder particles and their crystallographic characterization will be described. The results for the relative surface free energies of the facets will be presented and compared to theoretical calculations in literature.
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