Abstract
Filaments of Al-, Si-, and K-doped tungsten foil, 0.00254 cm thick, were heated to 2300°C in vacuo until a hot spot developed. Within the hot spot were voids varying in size from about 50 to 6000A. The larger voids were faceted with the major facets parallel to {110}. The relative surface tensions in the doped foil were in the order {110} < {112}< {111} < {100} as determined from a model of the voids. Selected area diffraction showed that the void surfaces were coated with a thin epitaxial layer of potassium with [311] W ‖[311] K in the majority of cases.
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