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A new kind of pressed Y2O3 doped Ba-W dispenser cathodes are prepared by a sol-gel method combined with high temperature sintering in dry hydrogen atmosphere. The results show that the growth of the grains is hampered by the pinning effect of Y2O3 distributing uniformly on the surfaces of tungsten particles, resulting in the formation of small grain size. It is found that Y2O3 improves the secondary...
A RE2O3-Mo cathode which contains Lu2O3 and Y2O3 with a certain weight ratio was made using a Sol-Gel technique and the spark plasma sintering technique. The maximum secondary emission yield (deltam) of this cathode could reach 4.6 while the activation temperature is only 900degC.
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