Growth of icosahedral boron-rich clusters at high pressure

Paul F. McMillan, Herve Hubert, Andrew Chizmeshya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The stoichiometry of boron suboxide (B 6O 1-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 B 2O 3 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 approximately 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 B 12 units around a central icosahedral nucleus. The result is a multiply-twinned particle in which each of the 20 elements has the R3̄m space group of the α-B structure.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium - Proceedings
EditorsN.M. Rodrigues, S.L. Soled, J. Hrbek
PublisherMRS
Pages453-459
Number of pages7
Volume499
StatePublished - 1998
EventProceedings of the 1997 MRS Fall Symposium - Boston, MA, USA
Duration: Dec 2 1997Dec 4 1997

Other

OtherProceedings of the 1997 MRS Fall Symposium
CityBoston, MA, USA
Period12/2/9712/4/97

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

McMillan, P. F., Hubert, H., & Chizmeshya, A. (1998). Growth of icosahedral boron-rich clusters at high pressure. In N. M. Rodrigues, S. L. Soled, & J. Hrbek (Eds.), Materials Research Society Symposium - Proceedings (Vol. 499, pp. 453-459). MRS.