TRIANGULAR STRUCTURES ON (111) SURFACES OF DIAMOND CRYSTALS SYNTHESIZED BY THE HOT-FILAMENT CVD METHOD

The morphology of the diamond crystal deposited by a hot-filament method has been studied by a high-resolution scanning electron microscope to elucidate the mechanism of the crystal growth. The growth of (111) faces is multinucleation, and the (111) surface consists of both many small triangles whose orientations are the same as those of the original (111) face of a cubo-octahedron and triangular pits surrounded by three triangles. The appearance of three (110) surfaces at the edge of the (111) surface is possibly explained by the inhomogeneity of the active carbon concentration oh the (111) surface. © 1990 IOP Publishing Ltd.