ОСОБЛИВОСТІ НАПРАВЛЕНОГО РОСТУ МОНОКРИСТАЛІВ АЛМАЗУ В СИСТЕМІ Fe-Co-Mg-C

T. V. Kovalenko; V. V. Lysakovskyi; S. O. Gordieiev; S. O. Ivakhnenko; O. O. Zanevskyi; O. V. Savytskyi; A. V. Burchenia; O. M. Suprun

T. V. Kovalenko V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
V. V. Lysakovskyi V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
S. O. Gordieiev V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
S. O. Ivakhnenko V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
O. O. Zanevskyi V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
O. V. Savytskyi V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
A. V. Burchenia V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
O. M. Suprun V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine

Keywords: Keywords: diamond single crystals, temperature gradient method, Fe-Co-Mg-C, defect-impurity state.

Abstract

The features of growing type Ib diamond single crystals in the Fe-Co-Mg-C solution-melt system by the temperature gradient method in a six-punch high-pressure apparatus CS-VII at a pressure of 6.0–6.2 GPa and a temperature of 1500–1750 °C have been investigated; the concentration intervals of the formation of diamonds of different types are determined depending on the amount of Mg addition; found that within 1.8 - 2.2, 2.2 - 3.5, 3.5 - 4.5 and 4.5 - 5.7 at. % Mg, the type of grown crystals changes in the sequence Ib → Ib + IIa → Ib + IIb → Ib, respectively. An increase in the mass growth rate of single crystals was established by a factor of 2 - 2.5, depending on the temperature and growth time.

FEATURES OF DIRECTED GROWTH OF DIAMOND SINGLE CRYSTALS IN THE Fe-Co-Mg-C SYSTEM

Abstract