Research output: Contribution to journal › Article › peer-review
Effect of the solvent-catalyst composition on diamond crystallization in the Mg-Ge-C system. / Palyanov, Yuri N.; Kupriyanov, Igor N.; Borzdov, Yuri M. et al.
In: Diamond and Related Materials, Vol. 89, 01.10.2018, p. 1-9.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Effect of the solvent-catalyst composition on diamond crystallization in the Mg-Ge-C system
AU - Palyanov, Yuri N.
AU - Kupriyanov, Igor N.
AU - Borzdov, Yuri M.
AU - Nechaev, Denis V.
PY - 2018/10/1
Y1 - 2018/10/1
N2 - Crystallization of diamond in the Mg-Ge-C system has been studied at 7.5 GPa and 1800 °C with the catalyst composition ranging from pure Mg to pure Ge. It is found that with increasing Ge content of the solvent-catalyst, the degree of graphite-to-diamond conversion gradually decreases from 92 to 16%, which is a consequence of the low solubility of carbon in the germanium melt. A decrease in the Mg/Ge ratio leads to a change in the diamond growth form from cube to octahedron and a drastic increase in the number of diamond nucleation centers. The spectral properties of the crystallized diamonds are studied by photoluminescence techniques. The correlations between the Ge content of the Mg-Ge-C system and the luminescence characteristics of the diamond crystals caused by the germanium-vacancy, silicon-vacancy, and nitrogen-vacancy optical centers are established. The results obtained in this study demonstrate that by changing the catalyst composition in the Mg-Ge-C system, it is possible to control the design of the diamond crystals and synthesize isometric, pyramidal, prismatic or needle-like crystals containing Ge-V centers.
AB - Crystallization of diamond in the Mg-Ge-C system has been studied at 7.5 GPa and 1800 °C with the catalyst composition ranging from pure Mg to pure Ge. It is found that with increasing Ge content of the solvent-catalyst, the degree of graphite-to-diamond conversion gradually decreases from 92 to 16%, which is a consequence of the low solubility of carbon in the germanium melt. A decrease in the Mg/Ge ratio leads to a change in the diamond growth form from cube to octahedron and a drastic increase in the number of diamond nucleation centers. The spectral properties of the crystallized diamonds are studied by photoluminescence techniques. The correlations between the Ge content of the Mg-Ge-C system and the luminescence characteristics of the diamond crystals caused by the germanium-vacancy, silicon-vacancy, and nitrogen-vacancy optical centers are established. The results obtained in this study demonstrate that by changing the catalyst composition in the Mg-Ge-C system, it is possible to control the design of the diamond crystals and synthesize isometric, pyramidal, prismatic or needle-like crystals containing Ge-V centers.
KW - Defect characterization
KW - High pressure high temperature (HPHT)
KW - Impurities
KW - Optical properties
KW - Solvent-catalysts
KW - Synthetic diamond
KW - VACANCY COLOR-CENTER
KW - HIGH-PRESSURE
KW - DEFECTS
KW - SPINS
KW - CENTERS
KW - MORPHOLOGY
UR - http://www.scopus.com/inward/record.url?scp=85050976859&partnerID=8YFLogxK
U2 - 10.1016/j.diamond.2018.08.002
DO - 10.1016/j.diamond.2018.08.002
M3 - Article
AN - SCOPUS:85050976859
VL - 89
SP - 1
EP - 9
JO - Diamond and Related Materials
JF - Diamond and Related Materials
SN - 0925-9635
ER -
ID: 16084234