Abstract
Synthetic diamond crystals crystallized in the presence of cobalt and nickel were studied by X-ray diffraction methods. Inclusions of metastable cobalt or nickel carbides are the most common imperfections in these crystals. Because of the presence of the forbidden 200 and 600 reflections, it is supposed that interstitial metal atoms are located in octahedral holes of the diamond structure. This observation suggests an active role played by the metal atoms in the nucleation and crystallization processes, so the metal acts simultaneously as a solvent and as a catalyst.
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