Defects were formed in single crystals grown from an Fe-Ni-C system at high temperatures and high pressures. The defects were examined by means of transmission electron microscopy, and Moiré fringe techniques. The defects were mainly vacancy-type prismatic dislocation loops, stacking-fault tetrahedra, arrays of parallel dislocation lines and dislocation networks. It was suggested that these defects in the diamond crystal were derived from vacancies and inclusions, which were contained in the diamond single crystal during diamond synthesis at high temperatures and high pressures.

Defect Formation in Diamond Single Crystals Grown from the Fe-Ni-C System at High Temperature and High Pressure. L.W.Yin, M.S.Li, F.Z.Li, D.S.Sun, Z.Y.Hao: Materials Research Bulletin, 2001, 36[13-14], 2283-