Growth of gem-grade nitrogen-doped diamond crystals heavily doped with the addition of Ba(N3)2

doi:10.1088/1674-1056/20/7/078103

Abstract Additive Ba(N₃)₂ as a source of nitrogen is heavily doped into the graphite—Fe-based alloy system to grow nitrogen-doped diamond crystals under a relatively high pressure (about 6.0 GPa) by employing the temperature gradient method. Gem-grade diamond crystal with a size of around 5 mm and a nitrogen concentration of about 1173 ppm is successfully synthesised for the first time under high pressure and high temperature in a China-type cubic anvil high-pressure apparatus. The growth habit of diamond crystal under the environment with high degree of nitrogen doping is investigated. It is found that the morphologies of heavily nitrogen-doped diamond crystals are all of octahedral shape dominated by {111} facets. The effects of temperature and duration on nitrogen concentration and form are explored by infrared absorption spectra. The results indicate that nitrogen impurity is present in diamond predominantly in the dispersed form accompanied by aggregated form, and the aggregated nitrogen concentration in diamond increases with temperature and duration. In addition, it is indicated that nitrogen donors are more easily incorporated into growing crystals at higher temperature. Strains in nitrogen-doped diamond crystal are characterized by micro-Raman spectroscopy. Measurement results demonstrate that the undoped diamond crystals exhibit the compressive stress, whereas diamond crystals heavily doped with the addition of Ba(N₃)₂ display the tensile stress.

Keywords: temperature gradient method gem-grade nitrogen-doped diamond crystals high temperature and high pressure additive Ba(N₃)₂

Received: 14 November 2010
Revised: 04 March 2011
Accepted manuscript online:

PACS:	81.10.Fq	(Growth from melts; zone melting and refining)
	61.72.S-	(Impurities in crystals)
	64.70.dg	(Crystallization of specific substances)
	07.57.Ty	(Infrared spectrometers, auxiliary equipment, and techniques)

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Huang Guo-Feng(黄国锋), Jia Xiao-Peng(贾晓鹏), Li Yong(李勇), Hu Mei-Hua(胡美华), Li Zhan-Chang(李战厂), Yan Bing-Min(颜丙敏), and Ma Hong-An(马红安) Growth of gem-grade nitrogen-doped diamond crystals heavily doped with the addition of Ba(N₃)₂ 2011 Chin. Phys. B 20 078103

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Growth of gem-grade nitrogen-doped diamond crystals heavily doped with the addition of Ba(N3)2

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Growth of gem-grade nitrogen-doped diamond crystals heavily doped with the addition of Ba(N₃)₂