Sc 2 O 3 -W matrix dispenser cathodes have been prepared by powder metallurgy method and tested in Pierce electron guns. The emission current density can reach 72 A/cm 2 at 900 • C and over 100 A/cm 2 can be achieved at a temperature higher than 950 • C. The emission improves and then keeps stable with time throughout the life testing period of 330 h at a continuous loading of 88 A/cm 2 pulsed current density with a pulse width of 10 μs and duty cycle of 0.2%. The cathode surface is covered by a semiconductor multilayer composed of Ba, Sc and O. The emission behavior of the cathode can be explained by a semiconductor model.
CitationWang J S, Zhang X Z, Liu W, et al. High current density Sc2O3-W matrix dispenser cathode. Sci China Inf Sci, 2012, 55: 98-105,
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