Abstract
During the growth of a diamond crystals from graphite through a thin film of metal-solvent a loss of growth stability and smooth edges is observed, when the crystal reach a certain size. This process is characterized by the formation of internal inclusions in a body of growing crystal, and diverse growth defects on a surface. For the analysis of the described process, a model of crystallization based on a cellular automata was used. The model took into account the kinetic phenomena of dissolution and crystallization of carbon on the surface graphite-metal and metal-diamond solubility difference between of graphite and diamond in liquid metal, and the process of a diffusion of carbon through the metal film. Simulation has shown that instability of crystal growth with smooth edges increases, owing to the origin of the feedback between the form of a crystal surface and the form of a dissolving graphite surface. This feedback amplifies in accordance with magnification of the size of a diamond crystal, owing to magnification of volume of the metal-solvent film. On the base of simulation analysis, conditions of large, perfect diamond crystal growth by recrystallization from graphite through a film of metal solvent were defined.
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