Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Patent
1996-07-22
2000-02-29
Griffin, Steven P.
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
B01J 306
Patent
active
060305959
ABSTRACT:
A high purity synthetic diamond with less impurities, crystals defects, strains, etc. can be provided, in which the nitrogen content is at most 10 ppm, preferably at most 0.1 ppm and the boron content is at most 1 ppm, preferably at most 0.1 ppm or in which nitrogen atoms and boron atoms are contained in the crystal and the difference between the number of the nitrogen atoms and that of the boron atoms is at most 1.times.10.sup.17 atoms/cm.sup.3. The strain-free synthetic diamond can be produced by a process for the production of a strain-free synthetic diamond by the temperature gradient method, which comprises using a carbon source having a boron content of at most 10 ppm and a solvent metal having a boron content of at most 1 ppm and adding a nitrogen getter to the solvent metal, thereby synthesizing the diamond.
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Nishibayashi Yoshiki
Satoh Shuichi
Sumiya Hitoshi
Griffin Steven P.
Hendrickson Stuart L.
Sumitomo Electric Industries Ltd.
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