Icosahedral packing of B12 icosahedra in boron suboxide (B6O)

Hervé Hubert, Bertrand Devouard, Laurence Garvie, Michael O'Keeffe, P R Buseck, William Petuskey, Paul F. McMillan

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207 Scopus citations

Abstract

Objects with icosahedral symmetry (I(h)) bear a special fascination; natural examples are rare, but include radiolaria and virus particles (virions). The discovery of C60, a molecule in the shape of a truncated icosahedron with I(h) symmetry, has aroused widespread interest. In 1962, Mackay described a radiating packing of spheres in I(h) symmetry, in which the centres of successive shells of spheres lie on the surfaces of icosahedra. There has been extensive investigation of the conditions under which such packing might be realized in assemblies of atoms or of molecules such as C60 (ref. 5). Here we report the preparation, at high temperatures and pressures, of boron suboxide (B6O) in which the preferred form of the material is as macroscopic, near-perfect, regular icosahedra, similar to the multiply-twinned particles observed in some cubic materials. A major difference is that B6O has a rhombohedral structure that nearly exactly fits the geometrical requirements needed to obtain icosahedral twins. These icosahedral particles have a structure that can be described as a Mackay packing of icosahedral B12 units, and thus has long-ranged order without translational symmetry.

Original languageEnglish (US)
Pages (from-to)376-378
Number of pages3
JournalNature
Volume391
Issue number6665
DOIs
StatePublished - Jan 22 1998

ASJC Scopus subject areas

  • General

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