Growth of icosahedral boron-rich clusters at high pressure

Paul F. McMillan; Herve Hubert; Andrew Chizmeshya

Growth of icosahedral boron-rich clusters at high pressure

Paul F. McMillan, Herve Hubert, Andrew Chizmeshya

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English (US)
Title of host publication	Materials Research Society Symposium - Proceedings
Editors	N.M. Rodrigues, S.L. Soled, J. Hrbek
Publisher	MRS
Pages	453-459
Number of pages	7
Volume	499
State	Published - 1998
Event	Proceedings of the 1997 MRS Fall Symposium - Boston, MA, USA Duration: Dec 2 1997 → Dec 4 1997

Other

Other	Proceedings of the 1997 MRS Fall Symposium
City	Boston, MA, USA
Period	12/2/97 → 12/4/97

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials

Cite this

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title = "Growth of icosahedral boron-rich clusters at high pressure",

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 R{\=3}m space group of the α-B structure. ",

author = "McMillan, {Paul F.} and Herve Hubert and Andrew Chizmeshya",

year = "1998",

language = "English (US)",

volume = "499",

pages = "453--459",

editor = "N.M. Rodrigues and S.L. Soled and J. Hrbek",

booktitle = "Materials Research Society Symposium - Proceedings",

publisher = "MRS",

note = "Proceedings of the 1997 MRS Fall Symposium ; Conference date: 02-12-1997 Through 04-12-1997",

}

TY - GEN

T1 - Growth of icosahedral boron-rich clusters at high pressure

AU - McMillan, Paul F.

AU - Hubert, Herve

AU - Chizmeshya, Andrew

PY - 1998

Y1 - 1998

N2 - 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.

AB - 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.

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M3 - Conference contribution

AN - SCOPUS:0032306117

VL - 499

SP - 453

EP - 459

BT - Materials Research Society Symposium - Proceedings

A2 - Rodrigues, N.M.

A2 - Soled, S.L.

A2 - Hrbek, J.

PB - MRS

T2 - Proceedings of the 1997 MRS Fall Symposium

Y2 - 2 December 1997 through 4 December 1997

ER -

Growth of icosahedral boron-rich clusters at high pressure

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