Effect of Ni70Mn25Co5 or Fe55Ni29Co16 on the Growth of Type-II a Large Diamonds with Al as Nitrogen Getter
| Periodical | Advanced Materials Research (Volume 266) |
|---|---|
| Main Theme | China Postdoctoral Forum on Materials Science and Engineering |
| Edited by | Deliang Chen |
| Pages | 89-92 |
| DOI | 10.4028/www.scientific.net/AMR.266.89 |
| Citation | Shang Sheng Li et al., 2011, Advanced Materials Research, 266, 89 |
| Online since | June, 2011 |
| Authors | Shang Sheng Li, Ning Luo, Xiao Lei Li, Tai Chao Su, You Mou Zhou, Yi Shun Zhang, Xiao Peng Jia |
| Keywords | Al, High Pressure, High Temperature, Type-II a Large Diamond |
| Price | US$ 28,- |
With adopting Al as the nitrogen getter in Ni70Mn25Co5 or Fe55Ni29Co16 catalyst, High-quality type-Ⅱa large diamonds have been grown under the conditions of about 5.5GPa and 1580K by using the temperature gradient method. While Al(2.0wt%) is added in the Fe55Ni29Co16, the nitrogen concentration(Nc) in the diamond is less than 1ppm. While Al(4.0wt%) is added in the Ni70Mn25Co5, the Nc in the diamond is highly arrived at 48ppm. The different of solubility of nitrogen in both catalyst at high pressure and high temperature is the basic reason of the different effect of eliminating nitrogen of Al. It can be shown in experamentals that Al is a less efficient nitrogen getter in Ni70Mn25Co5 than in Fe55Ni29Co16. While Al(2.0wt%) is added in the Fe55Ni29Co16, the high-quality type-Ⅱa large diamond, in which nitrogen is less than 1ppm and which the size was arrived at 3.3mm, had grown by decreasing the growth rate of diamond.
