摘要
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.
Cubic boron nitride(c-BN) was synthesized through benzene thermal method at a lower temperature of (300℃) by selecting liquid((C_2H_5)_2O·)BF_3 and Li_3N 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 BF_3, BCl_3 and BBr_3 in the same family compounds can react with Li_3N to synthesize BN since the strongest bond of B—F can be broken. Compared with BBr_3, liquid (C_2H_5)_2O·BF_3 is cheaper, less toxic and more convenient to operate. Li_3N not only provides nitrogen source but also has catalytic effect on accelerating the formation of c-BN at low temperature and pressure.
基金
Projects(20273007
50372006) supported by the National Natural Science Foundation of China
