Octahedral Overgrowth Structures on Impact Diamond

Nano- to micrometre-sized overgrowths on the (0001) surface of impact apographitic diamond were characterized. The structures are documented as octahedra, occasionally cubes, their contact and penetration twins, and irregular intergrowths. The internal of these overgrowths structures and their chemical composition were studied. Their postulated globular structure and block growth mechanism published earlier were disproved. A mechanism for the formation of these overgrowth structures is presented.