Abstract
Abstract Surface recrystallization of diamond has been found to occur at atmospheric pressure in a molten medium dissolving diamond and nickel simultaneously. The effect of crystallographic characteristics of the starting diamond specimens on nucleation and growth morphology of the metastably recry stallized diamond has been investigated. (111) cleavages and nearly (110) polished surfaces appeared to favour triangular and rectangular overgowths. respectively, whereas fracture surfaces appeared to favour both the morphologies equally. Generally, dense overgrowths occured near the substrate edges, macroscopic defects like steps, etc. on the substrate appeared to offer favourable sites for nucleation whereas individual microscopic defect sites like dislocation outcrops did not appear to act as sites for preferential nucleation. These studies also provided evidence which showed that the features are in fact deposits or overgrowths on the diamond substrate surfaces.
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