The hardest known oxide

L. S. Dubrovinsky (), N. A. Dubrovinskaia, V. Swamy, J. Muscat, N. M. Harrison, R. Ahuja, B. Holm and B. Johansson
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L. S. Dubrovinsky: Institute of Earth Sciences, Uppsala University
N. A. Dubrovinskaia: Institute of Earth Sciences, Uppsala University
V. Swamy: CSIRO Minerals
J. Muscat: CSIRO Minerals
N. M. Harrison: CCLRC Daresbury Laboratory
R. Ahuja: Condensed Matter Theory Group, Uppsala University
B. Holm: Condensed Matter Theory Group, Uppsala University
B. Johansson: Condensed Matter Theory Group, Uppsala University

Nature, 2001, vol. 410, issue 6829, 653-654

Abstract: Abstract A material as hard as diamond or cubic boron nitride has yet to be identified1,2,3,4,5,6, but here we report the discovery of a cotunnite-structured titanium oxide which represents the hardest oxide known. This is a new polymorph of titanium dioxide, where titanium is nine-coordinated to oxygen in the cotunnite (PbCl2) structure. The phase is synthesized at pressures above 60 gigapascals (GPa) and temperatures above 1,000 K and is one of the least compressible and hardest polycrystalline materials to be described.

Date: 2001
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DOI: 10.1038/35070650

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