Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Patent
1988-11-17
1990-08-21
Stoll, Robert L.
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
156DIG68, 501 86, 20415747, C01B 3106
Patent
active
049504630
ABSTRACT:
A purple diamond has an absorption coefficient of the Ib type nitrogen at 500 nm, within the range of 0.2-2 cm.sup.-1, an absorption coefficient of the N-V center at an absorption peak of 570 nm, within the range of 0.3-10 cm.sup.-1, and absorption coefficients of the GR1 center, H2 center, H3 center, and H4 center which are less than 0.2 cm.sup.-1 in the visible region. A method of producing such a purple diamond uses as a starting material an Ib type artificial synthetic diamond crystal wherein the Ib type nitrogen content in the crystal is within the range of 8.times.10.sup.17 -1.4.times.10.sup.19 atoms/cm.sup.3, such a starting material is subjected to an electron beam irradiation of 5.times.10.sup.16 -2.times.10.sup.18 electrons/cm.sup.2 at 2-4 MeV, and then annealing the irradiated diamond in a vacuum of less than 10.sup.-2 Torr, at a temperature of 800.degree.-1100.degree. C. for more than 25 hours.
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Satoh Shuichi
Tsuji Kazuwo
Fasse W. G.
Kane, Jr. D. H.
Kunemund Robert M.
Stoll Robert L.
Sumitomo Electric Industries Ltd.
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