Analysis of faceted tungsten grains on the surfaces of scandate cathodes fabricated from L-S and L-L powders

Xiaotao Liu,Qunfei Zhou,Bernard Vancil,Matthew J Beck,T John Balk,Tyler Maxwell

doi:10.1109/ivec.2018.8391507

Analysis of faceted tungsten grains on the surfaces of scandate cathodes fabricated from L-S and L-L powders

Xiaotao Liu, Qunfei Zhou + Show 4 more

https://doi.org/10.1109/ivec.2018.8391507

Copy DOI

Publication Date: Apr 1, 2018

Citations: 7

Affiliation: University of Kentucky, Beam Engineering for Advanced Measurements (United States)

#Tungsten Grains #Cathode Emission Properties + Show 8 more

Abstract
Full-Text PDF
Similar Papers

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).

Full Text