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High-Pressure, High-Temperature Synthesis of Superhard Boron Suboxide

Published online by Cambridge University Press:  10 February 2011

H. Hubert
Affiliation:
Materials Research Group in High Pressure Synthesis, Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604.
L. A. J. Garvie
Affiliation:
Department of Geology, Arizona State University, Tempe, AZ 85287-1404.
K. Leinenweber
Affiliation:
Materials Research Group in High Pressure Synthesis, Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604.
P. R. Buseck
Affiliation:
Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604.
W. T. Petuskeyt
Affiliation:
Materials Research Group in High Pressure Synthesis, Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604.
P. F. McMillan
Affiliation:
Materials Research Group in High Pressure Synthesis, Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604.
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Abstract

A multianvil device was used to investigate the formation of BxO phases produced in the 2 to 10 GPa pressure range with temperatures between 1000 and 1800 °C.Amorphous and crystalline B and BP were oxidized using B2O3 and CrO3. Using powder X-ray diffraction and parallel electron energy-loss spectroscopy (PEELS), we were unable to detect graphitic or diamondstructured B2O, reported in previous studies. The refractory boride B6O, which has the α-rhombohedral boron structure, is the dominant suboxide in the P and T range of our investigation. PEELS with a transmission electron microscope was used to characterize the boron oxides.

Type
Research Article
Copyright
Copyright © Materials Research Society 1996

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