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

Bhat, Shrikant and Lauterbach, Stefan and Dzivenko, Dmytro and Lathe, Christian and Bayarjargal, Lkhamsuren and Schwarz, Marcus and Kleebe, Hans-Joachim and Kroke, Edwin and Winkler, Björn and Riedel, Ralf (2014):
High-pressure high-temperature behavior of polymer derived amorphous B-C-N.
In: Journal of Physics: Conference Series, IOP Publishing, p. 182004, 500, (18), ISSN 1742-6596,
[Online-Edition: http://dx.doi.org/10.1088/1742-6596/500/18/182004],
[Article]

Abstract

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.

Item Type: Article
Erschienen: 2014
Creators: Bhat, Shrikant and Lauterbach, Stefan and Dzivenko, Dmytro and Lathe, Christian and Bayarjargal, Lkhamsuren and Schwarz, Marcus and Kleebe, Hans-Joachim and Kroke, Edwin and Winkler, Björn and Riedel, Ralf
Title: High-pressure high-temperature behavior of polymer derived amorphous B-C-N
Language: English
Abstract:

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.

Journal or Publication Title: Journal of Physics: Conference Series
Volume: 500
Number: 18
Publisher: IOP Publishing
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Jan 2015 09:32
Official URL: http://dx.doi.org/10.1088/1742-6596/500/18/182004
Identification Number: doi:10.1088/1742-6596/500/18/182004
Funders: The financial support by the German Research Foundation DFG within the priority program SPP1236 (Synthesis, in situ characterization and quantum mechanical modeling of Earth Materials, oxides, carbides and nitrides at extremely high pressures and , temperatures) is gratefully acknowledged.
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