| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1792520 | Journal of Crystal Growth | 2010 | 5 Pages |
Abstract
We have investigated the effect of Al on cBN formation in Li3N–hBN system at 5.0 GPa and 1300–1650 °C. Regular cBN single crystals of 0.2–0.5 mm in size were obtained. It appears that the presence of Al in hBN powder facilitates the formation of cBN crystals with regular shape, although it does not have any catalytic action for hBN–cBN phase transformation. With increasing Al concentration, the color of cBN changed darker from amber to black and the threshold temperature for cBN formation became higher. X-ray diffraction and Raman spectroscopy indicate that AlN formed by reaction of Li3N and Al and some B liberated in system.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
W. Guo, X. Jia, J. Shang, H.W. Xu, H.A. Ma,