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Effect of the KCl/K2CO3/H2O/C system composition on diamond and graphite crystallization at P = 7.5 GPa and τ = 15 h. (a) 1,500°C. (b) 1,600°C. 1, no diamond nucleation; 2, heterogenous diamond nucleation; 3, homogeneous and heterogenous diamond nucleation; half-filled circles, joint crystallization of diamond and metastable graphite; open circles, only diamond crystallization; filled circles, only graphite crystallization; circles with cross, no crystallization of graphite or diamond.
