Synthesis and characterization of diamonds with different nitrogen concentrations under high pressure and high temperature conditions. Issue 44 (25th October 2018)

• Record Type: Journal Article
• Authors: Chen, Liangchao; Miao, Xinyuan; Ma, Hongan; Guo, Longsuo; Wang, Zhanke; Yang, Zhiqiang; Fang, Chao; Jia, XiaoPeng
• Is Part Of: CrystEngComm. Volume 20:Issue 44(2018)
• Page Start: 7164
• Page End: 7169
• Publication Date: 2018-10-25
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c8ce01533c
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : In this study, {111}-oriented diamond crystals with different nitrogen concentrations were successfully synthesized in a series of experiments at 5.8 GPa pressure and 1380–1400 °C temperature. Abstract : In this study, {111}-oriented diamond crystals with different nitrogen concentrations were successfully synthesized in a series of experiments at 5.8 GPa pressure and 1380–1400 °C temperature. The nitrogen-vacancy (NV) centers were investigated in diamonds with different nitrogen concentrations. The Raman measurements indicated that the nitrogen atoms caused the Raman peaks to shift to a lower frequency. The photoluminescence (PL) results showed that the intensity of the negatively-charged nitrogen-vacancy (NV − ) centers increased with the increase in the nitrogen content when the diamonds had low nitrogen content (<80 ppm). With a further increase in the nitrogen content in the diamond crystals (>372 ppm), the intensity of the NV − centers gradually decreased until it became undetectable. Additionally, we found that the neutral nitrogen-vacancy (NV 0 ) centers were more common in diamonds with low nitrogen content. We believe that the results of this study provide a better understanding of the relationship between the nitrogen content and the NV centers in high pressure and high temperature (HPHT) synthetic diamonds.