Structural changes of wurtzite-type and zincblende-type boron nitrides by shock treatments View Full Text


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Article Info

DATE

1986-11

AUTHORS

Tamotsu Akashi, Han-Ryong Pak, Akira B. Sawaoka

ABSTRACT

Wurtzite-type boron nitride (w-BN) and zincblende-type boron nitride (z-BN) powders were shock-treated in the pressure range of 60 to 200 GPa to clarify their polymorphic transformations. The recovered BN powders revealed the effects of the shock wave and residual temperature on phase transition of BN. W-BN was partly transformed to z-BN by shock compression at a pressure of about 100 GPa. At pressures greater than 100 GPa, portions of the w-BN and z-BN powders changed into the BN having a turbostratic structure. Subsequently, this form was crystallized to graphite-like BN (g-BN) and a new form of BN due to high residual temperatures. This new BN modification, probably stabilized by the high surface energy associated with its fine crystallite size of less than 50 nm, was identified as fcc structure with a lattice parameter ofa0 = 0.8405 nm. The transformation of z-BN to w-BN was not detected in this post-shock study, as was observed in static high pressure studies. More... »

PAGES

4060-4066

References to SciGraph publications

  • 1984-02. On phase changes of carbon under dynamic conditions as observed by STEM in JOURNAL OF MATERIALS SCIENCE LETTERS
  • 1965-03. The effects of explosions on materials in JOURNAL OF STRUCTURAL CHEMISTRY
  • 1982-01. Sintering behaviour of the diamond-cobalt system at high temperature and pressure in JOURNAL OF MATERIALS SCIENCE
  • 1984-05. Polymorphic transformation of titanium dioxide by mechanical grinding in JOURNAL OF MATERIALS SCIENCE
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    URI

    http://scigraph.springernature.com/pub.10.1007/bf02431652

    DOI

    http://dx.doi.org/10.1007/bf02431652

    DIMENSIONS

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