Abstract
Highly faceted tungsten grains were observed experimentally on the surfaces of two scandate cathodes that had been prepared from L-S and L-L powders. Using Wulff analysis, the facets were identified as {100}, {110} and {112} crystallographic planes, and the {112} facets dominated with respect to surface area. The effect of these facets on cathode emission properties is discussed in terms of their influence on work function and also values of the fitting parameter in the Richardson-Dushman equation J=3DAT2exp(-φ/kT).
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