Synthesis of large diamond crystals containing high-nitrogen concentration at high pressure and high temperature using Ni-based solvent by temperature gradient method

doi:10.1088/1674-1056/19/11/118101

Abstract This paper reprots that with Ni-based catalyst/solvent and with a dopant of NaN₃, large green single crystal diamonds with perfect shape are successfully synthesized by temperature gradient method under high pressure and high temperature in a China-type cubic anvil high-pressure apparatus (SPD-6×1200), and the highest nitrogen concentration reaches approximately 1214-1257 ppm calculated by infrared absorption spectra. The synthesis conditions are about 5.5 GPa and 1240-1300 ℃. The growth behaviour of diamond with high-nitrogen concentration is investigated in detail. The results show that, with increasing the content of NaN₃ added in synthesis system, the width of synthesis temperature region for growth high-quality diamonds becomes narrower, and the morphology of diamond crystal is changed from cube-octahedral to octahedral at same temperature and pressure, the crystal growth rate is slowed down, nevertheless, the nitrogen concentration doped in synthetic diamond increases.

Keywords: high temperature and high pressure nitrogen-doped diamond crystal temperature gradient method additive NaN₃

Received: 19 March 2010
Revised: 12 May 2010
Accepted manuscript online:

PACS:	61.72.S-	(Impurities in crystals)
	62.50.-p	(High-pressure effects in solids and liquids)
	81.10.Dn	(Growth from solutions)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 50572032).

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Huang Guo-Feng(黄国锋), Jia Xiao-Peng(贾晓鹏), Li Shang-Sheng(李尚升), Zhang Ya-Fei(张亚飞), Li Yong(李勇), Zhao Ming(赵明), and Ma Hong-An(马红安) Synthesis of large diamond crystals containing high-nitrogen concentration at high pressure and high temperature using Ni-based solvent by temperature gradient method 2010 Chin. Phys. B 19 118101

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Synthesis of large diamond crystals containing high-nitrogen concentration at high pressure and high temperature using Ni-based solvent by temperature gradient method

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