Observation of an O8 molecular lattice in the ɛ phase of solid oxygen

Lars F. Lundegaard, Gunnar Weck, Malcolm I. McMahon (), Serge Desgreniers and Paul Loubeyre ()
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Lars F. Lundegaard: The University of Edinburgh
Gunnar Weck: Commissariat à l'Énergie Atomique
Malcolm I. McMahon: The University of Edinburgh
Serge Desgreniers: University of Ottawa
Paul Loubeyre: Commissariat à l'Énergie Atomique

Nature, 2006, vol. 443, issue 7108, 201-204

Abstract: Oxygen in pieces of eight As well as its importance as a gas, and in a bound form in chemistry, oxygen has interesting properties in its solid form. Solid oxygen comes in six crystallographic phases, one of which, the epsilon phase, is particularly unusual. It is dark red, absorbs strongly in the infrared, has lost the magnetic order seen in other phases and is stable over a large pressure range. The exact structure of epsilon oxygen has remained unknown since its discovery in 1979, until now. Single-crystal X-ray diffraction data reveal epsilon oxygen as O8, a rhombohedral unit made up of four O2 components held in a molecular lattice.

Date: 2006
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DOI: 10.1038/nature05174

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