Synthesis of Boron Nitride by Self-Propagating Reactions at High Pressure |
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| Authors: | Vladimir L Solozhenko ‡ Vladimir Z Turkevich§ Georg Will† |
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| Affiliation: | Mineralogical Institute, University of Bonn, D-531I5 Bonn, Germany, V. N. Bakul Institute for Superhard Materials of the Ukrainian National Academy of Sciences, Kiev 254074, Ukraine |
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| Abstract: | Peculiarities of the formation of BN in a self-propagating reaction between LiBF4 and Li3N have been studied under a wide range of p,T conditions within the region of thermodynamic stability of cBN. Boron nitride crystallized mainly in the form of highly ordered hBN (1700–2100 K), of mesographitic BN (2200–3000 K), or of turbostratic BN (>3000 K). Cubic boron nitride was obtained with a low yield (up to 14 vol%) as a result of precipitation from the metastable eutectic liquid in the BN-Li3N system. These results give further evidence for an alternative metastable behavior in the BN phase formation under high pressures. |
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