Materials science The hardest known oxide

A material as hard as diamond or cubic boron nitride has yet to be identified, 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 cotunnit...

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Published inNature (London) Vol. 410; no. 6829; pp. 653 - 654
Main Authors Dubrovinsky, L. S, Dubrovinskaia, N. A, Swamy, V, Muscat, J, Harrison, N. M, Ahuja, R, Holm, B, Johansson, B
Format Journal Article
LanguageEnglish
Published England Nature Publishing Group 05.04.2001
Subjects
Consultants
Cubic boron nitride
Dermatology
diamond
Hospitals
Materials science
Medical waiting lists
Oxides
Physicians
Titanium
Titanium dioxide
Titanium oxides
transition-metal dioxides
DIAMOND
TRANSITION-METAL DIOXIDES
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Summary:A material as hard as diamond or cubic boron nitride has yet to be identified, 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.
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ISSN:0028-0836
1476-4687
1476-4687
DOI:10.1038/35070650