Funct. Mater. 2021; 28 (4): 641-644

doi:https://doi.org/10.15407/fm28.04.641

Formation of mixed types of diamonds in the Fe-Co-Mg-C growth system at HTHP-crystallization

T.V.Kovalenko1, V.V.Lysakovskyi1, S.O.Ivakhnenko1, V.V.Strelchuk2, O.O.Zanevskyy1, A.S.Nikolenko2

1V. Bakul Institute for Superhard Materials National Academy of Sciences of Ukraine, 2 Avtozavodska Str., 04047 Kyiv, Ukraine
2V.Lashkarov Institute of Semiconductor Physics , National Academy of Sciences of Ukraine, 45 Nauky Ave., 03028 Kyiv, Ukraine

Abstract: 

This paper presents the results of a study of diamond single crystals of defect-impurity composition grown in a temperature gradient at high pressures and temperatures (HTHP-crystallization of diamond) in a Fe-Co-C solution with an addition of Mg depending on the amount of Mg, the content of nitrogen changes in various sectors of crystals growth, which causes a mixed type of crystals. The peculiarities of changes in the defect-impurity composition of the grown diamond single crystals were studied using IR spectroscopy and optical microscopy for concentration limits of 1.8-5.7 at. % of Mg content.

Keywords: 
diamond, single crystal, crystal growth, temperature gradient method, nitrogen and boron impurities, high pressures and temperatures.

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