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Growth of Icosahedral Boron-Rich Clusters at High Pressure

Published online by Cambridge University Press:  10 February 2011

Paul F. McMillan ,
Herve Hubert  and
Andrew Chizmeshya
Paul F. McMillan
Affiliation:
Materials Research Science and Engineering Center, Dept. of Chemistry and Biochemistry and Center for Solid State Science, Arizona State University, Tempe, AZ 85287pmcmillan@asu.edu
Herve Hubert
Affiliation:
Materials Research Science and Engineering Center, Dept. of Chemistry and Biochemistry and Center for Solid State Science, Arizona State University, Tempe, AZ 85287pmcmillan@asu.edu
Andrew Chizmeshya
Affiliation:
Materials Research Science and Engineering Center, Dept. of Chemistry and Biochemistry and Center for Solid State Science, Arizona State University, Tempe, AZ 85287pmcmillan@asu.edu
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Abstract

The stoichiometry of boron suboxide (B6O1-x) synthesized at high pressure lies closer to the nominal composition (x = 0) than materials obtained at atmospheric pressure. The crystallinity of materials obtained in the presence of molten B2O3 is also higher than for sintered powders. Further, for syntheses at 1700–1800 °C between 4 and approximately 5–6 GPa, the well-crystallized particles are dominated by large (up to ∼40 μm in diameter) icosahedral multiply-twinned particles. This unusual morphology is obtained by Mackay packing; i.e., by assembly of successive shells of icosahedral B12 units around a central icosahedral nucleus. The result is a multiply-twinned particle in which each of the 20 elements has the R 3 m space group of the α-B structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 499: Symposium DD – High Pressure Materials Research , 1997 , 453
Copyright
Copyright © Materials Research Society 1998

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