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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.
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. The results were all that BF3, BCl_3 and BBr_3 in the same family compounds can react with Li_3N to synthesize BN (boron nitride (o-BN) were obtained by X-ray powder diffractometry and Fourier transformation infrared spectroscopy 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.