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Journal Articles Acta Materialia Year : 2011

The equilibrium shape of nickel

Abstract

The crystal shape of Ni particles, dewetted in the solid state on sapphire substrates, was examined as a function of the partial pressure of oxygen (P(O 2)) and iron content using scanning and transmission electron microscopy. The chemical composition of the surface was characterized by atom-probe tomography. Unlike other face-centered cubic (fcc) equilibrium crystal shapes, the Ni crystals containing little or no impurities exhibited a faceted shape, indicating large surface anisotropy. In addition to the {1 1 1}, {1 0 0} and {1 1 0} facets, which are usually present in the equilibrium crystal shape of fcc metals, high-index facets were identified such as {1 3 5} and {1 3 8} at low P(O 2), and {0 1 2} and {0 1 3} at higher P(O 2). The presence of iron altered the crystal shape into a truncated sphere with only facets parallel to denser planes. The issue of particle equilibration is discussed specifically for the case of solid-state dewetting.
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Dates and versions

hal-00603250 , version 1 (18-04-2018)

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Hila Meltzman, D. Chatain, Dan Avizemer, T.M. Besmann, W.D. Kaplan. The equilibrium shape of nickel. Acta Materialia, 2011, 59 (9), pp.3473-3483. ⟨10.1016/j.actamat.2011.02.021⟩. ⟨hal-00603250⟩
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