Effect of the titanium doping of the Fe—Co—C solvent on the nitrogen content of diamond single crystals grown at high pressures and temperatures

Abstract

Diamond single crystals have been grown experimentally in Fe—Co-based alloys—solvents for carbon with a titanium content varying from 1 to 2 wt %. Average growth rates and morphological features of the grown crystals have been defined; the defect-and-impurity states and characteristics of macroinclusions have been analyzed. It has been found that an increase of titanium content of the Fe—Co—C solvent from 1 to 2 wt % brings about a change of the single crystal type from Ib to IIa. The use of the solvent having 1.5 wt % of titanium allows growing diamond single crystals of mixed Ib + IIb types.