Dispenser cathode with oxide of barium, scandium and aluminium

Details Dispenser cathode with oxide of barium, scandium and aluminium Dispenser cathode with oxide of barium, scandium and aluminium

H - Electricity

01

J

313/187

H01J 1/14 (2006.01) H01J 1/28 (2006.01)

Patent

CA 1042061

ABSTRACT A dispenser cathode comprising a porous metal body which had an emissive surface and the pores of which contain one or more compounds for dispensing at least barium and scandium to the emissive surface, which compounds are composed of at least barium oxide, scandium oxide and aluminium oxide, in which the quantity of scandium oxide is less than 10% by weight, and preferably 3% by weight, of the overall quantity of the dispensing compound (s), has substantially the sane good emissive properties as cathodes in which the dispensing compound comprises 5.5% by weight of scandium oxide and 18% by weight of yttrium oxide (Y2O3), or barium scandate as a dispensing compound.

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