Equilibrium Crystal Shape of Nickel

Journal Article · Sat Jan 01 04:00:00 EST 2011 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2011.02.021· OSTI ID:1081696

Meltzman, Hila ^[1]; Chatain, Dominique ^[2]; Avizemer, Dan ^[1]; Besmann, Theodore M ^[3]; Kaplan, Prof. Wayne D. ^[1]

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1. Technion, Israel Institute of Technology
2. Universite d'Aix-Marseille
3. ORNL

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(O2)) and iron content using scanning and transmission electron microscopy. The chemical composition of the surface was characterized by atom-probe tomography. Unlike other FCC equilibrium crystal shapes, the Ni crystals containing little or no impurities exhibited a facetted shape, indicating large surface anisotropy. In addition to the {111}, {100} and {110} facets, which are usually present in the equilibrium crystal shape of FCC metals, high index facets were identified such as {135} and {138} at low P(O2), and {012} and {013} at higher P(O2). 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.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: ME USDOE - Office of Management, Budget, and Evaluation; ORNL work for others
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1081696
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 9 Vol. 59; ISSN 1359-6454
• Country of Publication: United States
• Language: English