Morphology of diamond single crystals grown in the Fe-Co-Mg-C system

Kovalenko, T.V.; Lysakovskyi, V. V.; Kvasnytsya, V.M.; Ivakhnenko, Sergey; Suprun, O. M.; Burchenia, A. V.

doi:10.1016/j.jcrysgro.2018.11.040

Cited by 6 publications

(1 citation statement)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[1][2][3][4][5][6][7][8][9][10] High temperature and high pressure (HPHT) process based on temperature gradient method (TGM) is an effective way to obtain high-quality large single-crystal diamond. [11][12][13][14][15][16][17][18][19][20][21][22][23][24] For the HPHT preparation, the temperature gradient in molten catalyst is the main driving force for the growth of diamond, while the natural convection in the catalyst caused by the temperature gradient can effectively transport carbon atoms to the seed diamond surface. [20,23] Therefore, the temperature gradient and natural convection flow in the catalyst are significant factors that determine the crystal quality, morphology, and growth rate of the synthetic diamond.…”

Section: Introductionmentioning

confidence: 99%

Regulation mechanism of catalyst structure on diamond crystal morphology under HPHT process*

Li¹,

Cheng²,

Su³

et al. 2020

Chinese Phys. B

View full text Add to dashboard Cite

To elucidate the regulation mechanism of catalyst geometry structure to diamond growth, we establish three catalyst modes with different structures. The simulation results show that with the decrease of the protruding height of the catalyst, the low-temperature region gradually moves toward the center of the catalyst, which causes the distribution characteristics of the temperature and convection field in the catalyst to change. The temperature difference in vertical direction of the catalyst decreases gradually and increases in the horizontal direction, while the catalyst convection velocity has the same variation regularity in the corresponding directions. The variation of temperature difference and convection velocity lead the crystal growth rate in different crystal orientations to change, which directly affects the crystal morphology of the synthetic diamond. The simulation results are consistent with the experimental results, which shows the correctness of the theoretical rational analysis. This work is expected to be able to facilitate the understanding of catalyst structure regulation mechanism on diamond morphology and the providing of an important theoretical basis for the controllable growth of special crystal shape diamond under HPHT process.

show abstract