Abstract
Nanodispersed powders of the ternary graphite-like phases BC1.28N and BC2.14N have been used along with mixtures of powders of turbostratic BN and C in high-temperature shock compression followed by sharp quenching. The yield of diamond-like phases has attained 50% by volume. The excess of the graphite-like phase has been removed by treatment with molten alkalis containing nitrates and then with concentrated HClO4. The shock and chemical treatments alter the compositions of the diamond-like phases towards BCN in both of the BCxN specimens on account of the segregation of the excess carbon followed by the dissolution of it. Precision lattice-parameter measurements and line shape analysis indicate that the diamond-like phase is a BN ― C substitutional solid solution. Treatment of a mechanical mixture of the graphite-like phases of carbon and BN under the same p and T conditions led to the formation of a mixture of cubic boron nitride and diamond.
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Kurdyumov, A.V., Solozhenko, V.L. Shock Synthesis of Ternary Diamond-Like Phases in the B ― C ― N System. Powder Metallurgy and Metal Ceramics 39, 467–473 (2000). https://doi.org/10.1023/A:1011318506972
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DOI: https://doi.org/10.1023/A:1011318506972