Annealing type Ib or mixed type Ib-Ia natural diamond crystal

Details Annealing type Ib or mixed type Ib-Ia natural diamond crystal Annealing type Ib or mixed type Ib-Ia natural diamond crystal

1977-12-02

1978-11-07

Meros, Edward J.

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

51307, C01B 3106

Patent

active

041246900

ABSTRACT:
Type Ib or mixed type Ib-Ia natural diamond crystal is annealed at an annealing temperature ranging from about 1500.degree. C to about 2200.degree. C under a pressure which prevents significant graphitization of the diamond during the annealing to convert at least 20% of the total amount of type Ib nitrogen present in the crystal to type Ia nitrogen.

REFERENCES:
patent: 3083080 (1963-03-01), Bovenkerk
patent: 3141746 (1964-07-01), Delai
patent: 3297407 (1967-01-01), Wentorf
patent: 3423177 (1969-01-01), Bovenkerk
patent: 3574580 (1971-04-01), Stromberg et al.
patent: 4073380 (1978-02-01), Strong et al.
Klyuev et al, Sov. Phys. Solid State, vol. 16, No. 11, May, 1975, pp. 2118-2121.

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