Method of producing diamond of controlled quality

Details Method of producing diamond of controlled quality Method of producing diamond of controlled quality

1991-11-06

1996-04-23

Lewis, Michael

Coating processes

Direct application of electrical, magnetic, wave, or...

Plasma

427249, 117 86, 423446, C01B 3106

Patent

active

055101577

ABSTRACT:
Making a diamond substance exhibiting a cathodoluminescence spectrum with the peak at a photon energy greater than 2.8 eV (electron volt), the half-value and 20%-value width not exceeding 0.5 eV and 0.8 eV, respectively, comprising: providing a substrate in a closed chamber, introducing a matrix gas comprising H.sub.2 and one selected from hydrocarbon and CO to said chamber, exciting the gas to create a plasma while heating said substrate to a temperature of at least 700.degree. C. and, thus, causing deposition and growth of diamond substance which is crystallographically diamond, controlling parameters of the deposition by means of the cathodoluminescence record and recovering the diamond substance from the chamber.

REFERENCES:
patent: 4767608 (1988-08-01), Matsumoto et al.
patent: 4932331 (1990-06-01), Kurihara et al.
patent: 4985227 (1991-01-01), Ito et al.
Field, J. E. (Ed), The Properties of Diamond, Part I, Chapter 5, "Cathodoluminescence", pp. 165-181, Academic Press, New York (1979) (no month).

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