Low work function cathode

Details Low work function cathode Low work function cathode

1980-04-20

1982-04-13

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

Point source cathodes

29 2517, 313346R, 427 77, 252515, H01J 116, H01J 1910

Patent

active

043250009

ABSTRACT:
Disclosed is an electron-beam cathode which emits electrons with a low work function over a relatively wide range of temperature and pressure. The cathode is comprised of single crystal tungsten having zirconium and oxygen dopant atoms within the bulk thereof. This cathode is formed by the steps of attaching zirconium to a portion of the surface of single crystal tungsten, and heating the tungsten with the zirconium attached thereto in an atmosphere of oxygen to diffuse the zirconium and the oxygen into the bulk of the tungsten.

REFERENCES:
patent: 3374386 (1968-03-01), Charbonnier et al.
patent: 3425111 (1969-02-01), Denison, Jr.
patent: 3631291 (1971-12-01), Favreau
patent: 3678325 (1972-07-01), Nishida et al.
patent: 3947716 (1976-03-01), Fraser, Jr. et al.

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