Materials science. The hardest known oxide |
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| Authors: | Dubrovinsky L S Dubrovinskaia N A Swamy V Muscat J Harrison N M Ahuja R Holm B Johansson B |
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| Institution: | Institute of Earth Sciences, Uppsala University, S-752 36 Uppsala, Sweden. leonid.dubrovinsky@geo.uu.se |
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| Abstract: | 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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