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Chin. Phys. B, 2014, Vol. 23(11): 118102    DOI: 10.1088/1674-1056/23/11/118102
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev   Next  

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

Zheng You-Jin (郑友进)a, Huang Guo-Feng (黄国锋)b, Li Zhan-Chang (李战厂)b, Zuo Gui-Hong (左桂鸿)a
a Physics Department, Mudanjiang Normal College, Province Key Laboratory of Superhard Materials, Mudanjiang 157011, China;
b Department of Physics and Electronic Information Engineering, Chifeng University, Chifeng 024000, China
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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