Effect of the graphite perfection on thc HP-HT diamond synthesis in a Ni-Mn-C System

摘要

Changes in the graphite structure used as precursor for diamond synthesis is a phenomenon observed during high pressure and high temperature processes in the presence of a solvent-catalyst metals. In this work, experimental results have shown that the initial stmcture of the graphite material has a significant influence on the yield and the possibility of formation of diamond. An association between the degree of structural perfection of the graphite and the success in producing diamond crystals was found to exist even for conditions outside the field of diamond stability in the carbon P-T equilibrium diagram.