Abstract
Conventional barium aluminate-impregnated tungsten matrix cathodes were coated with a metallic layer such as iridium, osmium, platinum or tungsten sputtered in an argon atmosphere. This simple practical procedure has been shown to lead to an enhancement in emission capability in the case of an iridium-coated or osmium-coated cathode, comparable with that reported in the literature using very much more complex procedures. The iridium- or osmium-coated cathodes exhibit effective work functions of 1·93 to 1·98 ev over a range 1200 to 1370 K. Results on coated (Os, Ir, Pt, W) and uncoated cathodes with 45% porosity matrices are presented and compared with an iridium-coated cathode with a 20% porosity matrix.
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