Low pressure synthesis of boron nitride with (C2H5)2O·BF3 and Li3N precursor①
来源期刊:中南大学学报(英文版)2005年第1期
论文作者:王少波 徐晓伟 范慧丽 李玉萍
文章页码:60 - 63
Key words:benzene thermal method; boron nitride; boron trifluoride etherate; lithium nitride; cubic boron nitride; orthorhombic boron nitride; hexagonal boron nitride
Abstract: 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, BCl3and 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.