Abstract
It has been shown that when growing diamond single crystals in the diamond thermodynamic stability region using solvents based on iron-cobalt-zirconium alloys virtually all crystal faces exhibit microrelieves, which represent the combination of valleys and peaks, whose depth and height do not exceed several micrometers. The origin of the microrelief has been caused by the features of the solvent crystallization and phase transformations in it as the temperature decreases. A liquid solvent is crystallized as a mixture of elongated grains of composition (Fe, Co)3C with interlayers of α-solid solution of eutectic composition between them, which results in the formation of valleys and peaks on the crystal surface. Cooling the solvent leads also to the formation of microscopic diamond single crystals and precipitation of excess graphite from the α-solid solution of composition (Fe, Co)3C. The relief observed on faces of the grown crystals is of the surface nature only.
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