High-pressure high-temperature behavior of polymer derived amorphous B-C-N

18th APS-SCCM; 24th AIRAPT

Bhat, Shrikant^1 ; Lauterbach, Stefan^1 ; Dzivenko, Dmytro^1 ; Lathe, Christian^2 ; Bayarjargal, Lkhamsuren^3 ; Schwarz, Marcus^4 ; Kleebe, Hans-Joachim^1 ; Kroke, Edwin^4 ; Winkler, Björn^3 ; Riedel, Ralf^1

FB Material- und Geowissenschaften, Technische Universität Darmstadt, Darmstadt, Germany^1

Geoforschungszentrum (GFZ), Potsdam, Germany^2

Institut für Geowissenschaften, Goethe-Universität Frankfurt, Frankfurt am Main, Germany^3

Institut für Anorganische Chemie, TU-Bergakademie Freiberg, Freiberg, Germany^4

关键词: BCN compounds;    Diamond-like;    High pressure high temperature;    HP-HT synthesis;    Hydroboration reactions;    Multi-anvil apparatus;    Thermal and chemical stabilities;    XPS analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/18/182004/pdf
DOI  :  10.1088/1742-6596/500/18/182004

来源: IOP

【 摘 要 】

Dense diamond-like BCN compounds are of interest due to their extreme hardness and predicted excellent thermal and chemical stability, which are superior to those of diamond and c-BN. Here, we report on the high-pressure high-temperature (HP-HT) behavior of amorphous BC2N and BC4N -as potential precursors for HP-HT synthesis of diamond-like BCN. Prepared via hydroboration reaction of piperazine borane and pyridine borane, respectively, amorphous BC2N and BC4N are characterized by well-mixed B-N, C-C and C-N bonds, confirmed by XPS analysis. These BCN compositions were subjected to pressures between 5-12 GPa and temperatures up to 1700 °C using multi-anvil apparatus and toroid-type press. In- and ex-situ X-ray diffraction reveals the decomposition of BC4N to graphite and h-BN between 5 and 12 GPa above 500°C, in contrast to BC2N which remains amorphous up to 1600°C.