On the nature of the surface phases formed on carbidized tungsten during field evaporation
M. V. LoginovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgV. N. ShrednikA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg
ABI
Abstract
It is it is shown by means of an atom probe that the subsurface regions of a carbonized tungsten tip (the so-called terraced crystal) has the composition of tungsten carbides which are enriched with carbon as compared to WC. The properties of the nonequilibrium surface phases formed as a result of anisotropic field evaporation of the crystal are elucidated, and the mechanisms by which these phases relax to the equilibrium state are discussed.
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