Effects of Fe additive on diamond crystallization from carbonyl nickel powders-C system under HPHT condition
Li Yonga), Jia Xiao-Pengb), Feng Yun-Guanga), Fang Chaob), Fan Li-Juana), Li Ya-Dongb), Zeng Xianga), Ma Hong-Anb)
       
Optical images of the diamonds synthesized from carbonyl nickel powders-C and carbonyl nickel powders+Fe–C systems: Panels (a), (b), and (c) show the diamonds obtained from carbonyl nickel powders at 6.0 GPa and 1410, 1420, and 1435 °C, respectively. Panels (d), (e), and (f) show the diamonds synthesized from carbonyl nickel powders with the additive of Fe 5 wt%, 8 wt%, and 15 wt%, obtained at 6.0 GPa and 1430, 1430, and 1435 °C, respectively.