中国物理B ›› 2010, Vol. 19 ›› Issue (11): 118101-118101.doi: 10.1088/1674-1056/19/11/118101

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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

李尚升1, 黄国锋2, 张亚飞2, 李勇2, 赵明2, 马红安2, 贾晓鹏3   

  1. (1)Henan Polytechnic University, Jiaozuo 454000, China; (2)National Lab of Superhard Materials, Jilin University, Jilin 130012, China; (3)National Lab of Superhard Materials, Jilin University, Jilin 130012, China; Henan Polytechnic University, Jiaozuo 454000, China
  • 收稿日期:2010-03-19 修回日期:2010-05-12 出版日期:2010-11-15 发布日期:2010-11-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 50572032).

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

Huang Guo-Feng(黄国锋)a), Jia Xiao-Peng(贾晓鹏)a)b), Li Shang-Sheng(李尚升)b), Zhang Ya-Fei(张亚飞)a), Li Yong(李勇)a), Zhao Ming(赵明)a), and Ma Hong-An(马红安)a)   

  1. a National Lab of Superhard Materials, Jilin University, Jilin 130012, China; b Henan Polytechnic University, Jiaozuo 454000, China
  • Received:2010-03-19 Revised:2010-05-12 Online:2010-11-15 Published:2010-11-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 50572032).

摘要: 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.

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.

Key words: high temperature and high pressure, nitrogen-doped diamond crystal, temperature gradient method, additive NaN3

中图分类号:  (Impurities in crystals)

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