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High-Pressure, High-Temperature Syntheses of Super-Hard α-Rhombohedral Boron-rich Solids in the B-C-N-O

Published online by Cambridge University Press:  10 February 2011

Hervé Hubert ,
Laurence A.J. Garvie ,
Bertrand Devouard  and
Paul F. McMillan
Hervé Hubert
Affiliation:
Department of Chemistry & Biochemistry and Arizona State University, Tempe, AZ 85287.
Laurence A.J. Garvie
Affiliation:
Department of Geology, Arizona State University, Tempe, AZ 85287.
Bertrand Devouard
Affiliation:
Department of Geology, Arizona State University, Tempe, AZ 85287.
Paul F. McMillan
Affiliation:
Department of Chemistry & Biochemistry and Arizona State University, Tempe, AZ 85287.
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Abstract

We prepared α-rhombohedral (α-rh.) B-rich materials in the B-C-N-O system at high-pressures and temperatures. Samples were synthesized using a multianvil device and characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and parallel electron energy-loss spectroscopy (PEELS). The B-C-O compounds were obtained by reducing B2O3 with B, or mixtures of B and C between 1 to 10 GPa and 1200° and 1800° C In the B-O system we synthesized boron suboxide (nominally B6O) of high purity, crystallinity, and close to stoichiometric. Quantitative analyses give B6O0.95 and B6O0.77 for high-pressure and room-pressure samples, respectively. Between 4 to 5.5 GPa, B6O formed as macroscopic near-perfect regular icosahedra (to 30 μm in diameter). In the B-C-O system, intermediate phases were prepared showing evidence of solid solution between B4C and B6O. Boron carbide crystals, to 20 μm, containing a significant amount of O, typically B6C1.1O0.33 and B6C1.28O0.31, were grown for mixtures in which B and C were reacted with excess B2O3 at 7.5 GPa and 1700 °C. We also report the first conclusive bulk synthesis of a new boron nitride, B6N1-x. This subnitride was synthesized from B and hexagonal BN at 7.5 GPa and 1700 °C. XRD and PEELS shows that the boron subnitride has the α-rh. B structure and average composition B6N0.92

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 499: Symposium DD – High Pressure Materials Research , 1997 , 315
Copyright
Copyright © Materials Research Society 1998

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