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Effect of oxygen on the growth of cubic boron nitride using Mg3N2 as catalyst

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Abstract

Cubic boron nitride (cBN) was synthesized from hexagonal boron nitride (hBN) under high pressure and high temperature using Mg3N2 as catalyst. The yield and morphology of cBN were investigated in relation to the oxygen impurity of the BN-Mg3N2 system. Magnesium oxide precipitated as a by-product in this system and the amount of the precipitate increased with an increase in the oxygen content of the starting materials. The morphology and surface patterns of cBN crystals synthesized using an hBN which contained oxygen showed unusual features. It was confirmed that the precipitation of MgO interfered with the free growth of cBN crystals. Purification of starting materials and addition of zirconium powder to the catalyst as an oxygen getter increased the yield of cBN crystals showing smooth surfaces.

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Author notes

  1. Hideo Hiraoka

    Present address: Central Research Laboratory, Denka Ltd, Machida, Tokyo

Authors and Affiliations

  1. National Institute for Researches in Inorganic Materials, 1-1 Namiki, Sakura, Niihari, 305, Ibaraki, Japan

    Tadao Sato, Hideo Hiraoka, Tadashi Endo, Osamu Fukunaga & Minoru Iwata

Authors
  1. Tadao Sato
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  2. Hideo Hiraoka
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  3. Tadashi Endo
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  4. Osamu Fukunaga
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  5. Minoru Iwata
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Sato, T., Hiraoka, H., Endo, T. et al. Effect of oxygen on the growth of cubic boron nitride using Mg3N2 as catalyst. J Mater Sci 16, 1829–1834 (1981). https://doi.org/10.1007/BF00540630

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  • DOI: https://doi.org/10.1007/BF00540630

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