Evolution of nitrogen structure in N-doped diamond crystal after high pressure and high temperature annealing treatment

doi:10.1088/1674-1056/23/11/118102

Abstract

In this paper, we have reported an investigation on the evolution of nitrogen structures in diamond crystals which contain nitrogen donor atoms in the range of 1500 ppm-1600 ppm following an annealing treatment at a high pressure of about 6.5 GPa and high temperatures of 1920 K-2120 K. The annealing treatment was found to completely transform nitrogen atoms originally arranged in a single substitutional form (C-center), into a pair form (A-center), indicated from infrared (IR) spectra. The photoluminescence (PL) spectra revealed that a small fraction of nitrogen atoms remained in C-center form, while some nitrogen atoms in A-center form were further transformed into N3 and H3 center structures. In addition, PL spectra have revealed the existence of two newly observed nitrogen-related structures with zero phonon lines at 611 nm and 711 nm. All these findings above are very helpful in understanding the formation mechanism of natural diamond stones of the Ia-type, which contains nitrogen atoms in an aggregated form.

Keywords: IaA-type diamond crystal nitrogen aggregation H3 center N3 center

Received: 29 March 2014
Revised: 12 May 2014
Accepted manuscript online:

PACS:	81.10.Fq	(Growth from melts; zone melting and refining)
	61.72.S-	(Impurities in crystals)
	74.62.Dh	(Effects of crystal defects, doping and substitution)
	78.55.-m	(Photoluminescence, properties and materials)

Fund:

Project supported by the Natural Science Foundation of Heilongjiang Province, China (Grant No. E201341) and the Open Research Program of Key Lab of Superhard Materials of Mudanjiang Normal College, China (Grant No. 201302).

Corresponding Authors: Zheng You-Jin
E-mail: zyjmsy@163.com

Cite this article:

Zheng You-Jin (郑友进), Huang Guo-Feng (黄国锋), Li Zhan-Chang (李战厂), Zuo Gui-Hong (左桂鸿) Evolution of nitrogen structure in N-doped diamond crystal after high pressure and high temperature annealing treatment 2014 Chin. Phys. B 23 118102

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[1]	Influence of annealing treatment on as-grown Ib-type diamond crystal at a high temperature and high pressure Huang Guo-Feng (黄国锋), Yin Ji-Wen (尹辑文), Bai Hong-Bo (白洪波), HuYi-Ga (胡义嘎), Kai Li (凯丽), Jing Jing (静婧), Ma Hong-An (马红安), Jia Xiao-Peng (贾晓鹏). Chin. Phys. B, 2012, 21(10): 108102.

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Evolution of nitrogen structure in N-doped diamond crystal after high pressure and high temperature annealing treatment

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