Low pressure synthesis of boron nitride with(C2H5)2O·BF3 and Li3N precursor

• 作 者: WANG Shao-bo XU Xiao-wei FAN Hui-li LI Yu-ping
• 机 构: School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 1
• 出 处: 中南工业大学学报（英文版）
• 发表日期: 2005年1期
• 关键词: benzene thermal method boron nitride boron trifluoride etherate lithium nitride

Cubic boron nitride(c-BN) was synthesized through benzene thermal method at a lower temperature of 300 ℃ by selecting liquid(C2H5)2O·BF3 and Li3N as reactants. Hexagonal boron nitride(h-BN) and orthorhombic boron nitride(o-BN) were also obtained. The samples were characterized by X-ray powder diffractometry and Fourier transformation infrared spectroscopy. The results show that all the BF3, BCl3 and BBr3 in the same family compounds can react with Li3N to synthesize BN since the strongest bond of B-F can be broken. Compared with BBr3, liquid (C2H5)2O·BF3 is cheaper, less toxic and more convenient to operate. Li3N not only provides nitrogen source but also has catalytic effect on accelerating the formation of c-BN at low temperature and pressure.