CJCU

Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (2): 239.

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Magnesiothermic Reduction Preparation of Polycrystalline Hexagonal Boron Nitride with Round-flake Morphology

WANG Ji-Lin, PAN Xin-Ye, GU Yun-Le*   

  1. School of Materials Science and Engineering, Nano and Ceramic Materials Research Center, Wuhan Institute of Technology, Wuhan 430073, China
  • Received:2009-04-17 Online:2010-02-10 Published:2010-02-10
  • Contact: GU Yun-Le. E-mail: ncm@mail.wit.edu.cn
  • Supported by:

    湖北省教育厅科学研究计划基金(批准号: Z20081502)资助.

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Abstract:

Polycrystalline boron nitride(BN) powders were prepared by magnesiothermic reduction of boron oxide(B2O3) and ammonium chloride(NH4Cl) catalyzed with ferric oxide(Fe2O3) at temperatures ranging from 700 to 850 ℃ under ambient pressure. X-ray diffraction(XRD) result shows a hexagonal phase with lattice parameters a=0.2499 nm and c=0.6682 nm. Fourier transform infrared(FTIR) spectroscopy indicates characteristic absorption peaks of hexagonal BN at 790 and 1380 cm-1. Scanning electron microscopy(SEM) reveals that the submicro-polycrystallites have approximately uniform round-flake morphology with an average diameter of about 0.9 μm and an average thickness of about 100 nm. Catalytic formation mechanism of the product was also discussed.

Key words: Hexagonal boron nitride; Magnesiothermic reduction; Polycrystalline powder

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