中国物理B ›› 2010, Vol. 19 ›› Issue (11): 118101-118101.doi: 10.1088/1674-1056/19/11/118101
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
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)†
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.
中图分类号: (Impurities in crystals)