Low pressure synthesis of boron nitride with (C2H5)2O · BF3 and Li3N precursor
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Cubic boron nitride(c-BN) was synthesized through benzene thermal method at a lower temperature of 300 °C 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.
Key wordsbenzene thermal method boron nitride boron trifluoride etherate lithium nitride cubic boron nitride orthorhombic boron nitride hexagonal boron nitride
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- WANG Guang-zhu, ZHANG Xiang-fa, ZHANG Kui. Application of c-BN and technical progress of mechanical machining[J]. Industrial Diamond, 2002, (3): 33–36. (in Chinese)Google Scholar
- LIANG Ying-jiao, CHE Yin-chang. Thermodynamics Data Handbook of Inorganic Compound [M]. Shenyang: Northeast University Press, 1993. (in Chinese)Google Scholar
- XU Xiao-wei, LIU Zhi-pu, LIN Qian-shao, et al. Li3N function in BN synthesis[J]. Chinese Journal of High Pressure Physics, 2001, 15(1): 75–79. (in Chinese)Google Scholar
- LI Zhe-kui. Studies of the action of Li3N for synthesizing BN at low temperature[J]. Journal of Yanbian University (Natural Science), 2000, 26(2): 149–156. (in Chinese)Google Scholar