Abstract
Condensation and adsorption of Ni with a thickness from several tenths of a monoatomic layer to several hundred layers on the surface of a single-crystal W tip has been studied by field emission microscopy in a wide range of surface temperature T. In contrast to adsorption of Si on W, adsorption of Ni on W does not induce any W surface reconstruction in the entire range of substrate temperatures T. Phenomena of bulk diffusion and field reconstruction of the surface are not observed as well. At multilayer Ni coatings, Ni crystallites with peculiar structure and faceting grow on the W surface (on close-packed and loose W faces at small and large T values, respectively). The presence of a strong external electric field makes it possible to retain crystallites on the W surface at temperatures much higher than their dissolution temperature in the absence of an external field.
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