Abstract
In the present work, the morphological and structural evolution occurring upon graphitization of synthetic diamond microcrystals of cuboctahedral shape at 1600 °C during vacuum annealing was studied. The most developed facets of the initial diamond crystals are octahedral {111} and cube {100} facets. It was found that graphitization starts from the vertices and edges of the crystals. The {111} facets were more prone to graphitization than the {100} facets. Annealing of the partially graphitized diamond microcrystals in air helped revealing the orientation relationship of the forming graphite platelets with the parent diamond substrate. The graphite structures forming upon full graphitization of the diamond microcrystals retained the shape of the initial crystals.
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