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Journal of Materials Science

, Volume 29, Issue 24, pp 6616–6619 | Cite as

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

  • I. S. Gladkaya
  • G. N. Kremkova
  • N. A. Bendeliani
  • H. Lorenz
  • U. Kuehne
Papers

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.

Keywords

Polymer Crystallization Boron High Pressure Hexagonal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • I. S. Gladkaya
    • 1
  • G. N. Kremkova
    • 1
  • N. A. Bendeliani
    • 1
  • H. Lorenz
    • 2
  • U. Kuehne
    • 2
  1. 1.Institute of High Pressure PhysicsCIS Academy of SciencesTroitzkRussia
  2. 2.High Pressure LaboratoryUniversity PotsdamPotsdamGermany

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