Barium-aluminum-scandate dispenser cathode

Details Barium-aluminum-scandate dispenser cathode Barium-aluminum-scandate dispenser cathode

1975-12-02

1977-02-08

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

313337, 252521, H01J 114, H01J 1906

Patent

active

040073939

ABSTRACT:
A dispenser cathode comprising a porous metal body which has 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 same 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 (Y.sub.2 O.sub.3), or barium scandate as a dispensing compound.

REFERENCES:
patent: 3076916 (1963-02-01), Koppius
patent: 3358178 (1967-12-01), Figner et al.
patent: 3497757 (1970-02-01), Zalm et al.
patent: 3530327 (1970-09-01), Zollweg et al.
patent: 3558966 (1971-01-01), Hill et al.
patent: 3719856 (1973-03-01), Koppius
patent: 3766423 (1973-10-01), Menelly

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