Polycrystalline diamond emitter

Details Polycrystalline diamond emitter Polycrystalline diamond emitter

1977-11-16

1979-08-14

Smith, Alfred E.

Electric lamp and discharge devices

Electrode and shield structures

Point source cathodes

250423R, 313311, 313 61S, H01J 116, H01J 114

Patent

active

041646800

ABSTRACT:
Ultrasharp diamond edges and points which are usable as high intensity point sources for the emission of electrons, ions, X-rays, coherent and incoherent light and high frequency electromagnetic radiation are produced by preparing and classifying ultrafine diamond powder having a particle size of 10 to 100 angstroms, placing the powder in a diamond mold defining the ultrasharp edge or point to be produced and applying a pressure of the order of 80 to 90 kb while heating the powder to a temperature of the order of 2440.degree. K. in an ultrahigh vacuum or inert atmosphere after degasing to avoid oxidation of the diamond powder.

REFERENCES:
patent: 3646841 (1972-03-01), Villalobos
patent: 4084942 (1978-04-01), Villalobos

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