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The binary system of BN-Mg3N2 under high pressures and temperatures

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Abstract

The phase relations in the binary system of BN-Mg3N2 were investigated in regions of pressure, P, from 3.0 GPa to 8.0 GPa and temperature, T, up to 1900 K by means of in situ differential thermal analysis (DTA) and X-ray diffraction (XRD) of the quenched products. It was found that the succession in formation of the intermediate compounds Mg3BN3 (HP-phase) and Mg3B2N4 depends on the molar ratios of hexagonal boron nitride (hBN) and Mg3N2 and on the P-T conditions. In the P-T region of cubic boron nitride (cBN) growth, the system has three metastable eutectics such as Mg3N2-hBN, Mg3BN3-hBN and Mg3B2N4-hBN. It was found that eutectic temperatures are pressure dependent. The difference in the lower-temperature limits of cBN growth regions is explained by cBN crystallization from different eutectic melts.

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Authors and Affiliations

  1. Institute of High Pressure Physics, CIS Academy of Sciences, 142092, Troitzk, Moscow region, Russia

    I. S. Gladkaya, G. N. Kremkova & N. A. Bendeliani

  2. High Pressure Laboratory, University Potsdam, Telegrafenberg A52, 1561, Potsdam, Germany

    H. Lorenz & U. Kuehne

Authors
  1. I. S. Gladkaya
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  2. G. N. Kremkova
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  3. N. A. Bendeliani
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  4. H. Lorenz
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  5. U. Kuehne
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Gladkaya, I.S., Kremkova, G.N., Bendeliani, N.A. et al. The binary system of BN-Mg3N2 under high pressures and temperatures. JOURNAL OF MATERIALS SCIENCE 29, 6616–6619 (1994). https://doi.org/10.1007/BF00354030

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  • DOI: https://doi.org/10.1007/BF00354030

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