Green diamond and method of producing the same

Details Green diamond and method of producing the same Green diamond and method of producing the same

1988-12-30

1990-09-25

Chaudhuri, Olik

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

156DIG68, 372 37, 501 86, C01B 3106

Patent

active

049592017

ABSTRACT:
A green diamond has a nitrogen content in its crystals within the range of 5.times.10.sup.16 to 3.times.10.sup.19 atoms/cm.sup.3, an absorption coefficient of H2 centers at a wavelength of 800 nm within the range of 0.3 to 6 cm.sup.-1, an absorption coefficient of the Ib type nitrogen at a wavelength of 500 nm within the range of 0.05 to 1.5 cm.sup.-1, and absorption coefficients of H3 centers, H4 centers, N-V centers and GR1 centers in the visible region of not more than 0.2 cm.sup.-1. Such green diamonds are produced by preparing a clear-yellow Ib type diamond having a nitrogen content in crystals within the range of 5.times.10.sup.16 to 3.times.10.sup.19 atoms/cm.sup.3, irradiating this diamond with an electron beam having not less than 1.times.10.sup.18 electrons/cm.sup.2 at an accelerating voltage of 2 to 4 MeV, and subjecting the diamond to a heat treatment at a temperature of 1500.degree. C.-1800.degree. C. in a vacuum of not more than 10.sup.-3 torr.

REFERENCES:
patent: 3616357 (1971-10-01), Haynes
patent: 4073380 (1978-02-01), Strong et al.
patent: 4082185 (1978-04-01), Strong
patent: 4174380 (1979-11-01), Strong et al.
patent: 4399364 (1983-08-01), Evans et al.
Rand, Synthetic Diamond for Color Center Lasers, FA9-1, pp. 138-140.
Reports on Progress in Physics, vol. 42, 1979, pp. 1606-1659, Optical Absorption and Luminescence by J. Walker.

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