Experimental studies of phase equilibria in the Co–Mn–C system and construction of the system melting diagram at atmospheric pressure have allowed a comprehensive investigation of capillary phenomena at the Co–Mn growth medium–carbon material interface that occur due to variations of both the liquid phase composition and melting temperature (along the solid–liquid equilibrium line). It was shown that cobalt melts containing 10–14 at.% Mn might be recommended as growth media for diamond synthesis. Along with the relatively low p,T-parameters, the introduction of manganese in such quantities provides optimal synthesis conditions, i.e., the lowest energy at the crystal – growth medium interface with a rather high solubility of carbon in the melt.

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The results of experimental studies and thermodynamic calculations of melting diagrams of the 3-d transition metal-carbon systems are discussed in this paper. The authors present their theoretical and experimental results which complement the earlier available data. The Fe-Ni-C, Fe-Co-C, and Mn-Ni-C systems are shown to be suitable for diamond synthesis at relatively low p,T-parameters.