Abstract
The stationary form of a clean nickel tip is produced in a field electron microscope (FEM) under ultra-high vacuum. The shape of the tip is then visualized in a transmission electron microscope (TEM). It is shown that the cap around the apex of a bulbous tip closely approximates the equilibrium shape of an isolated nickel crystal. The anisotropy of the surface energy (γ) of nickel is measured as a function of the crystallographic orientation.
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