The hardest known oxide
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Open Access
- 5 April 2001
- journal article
- research article
- Published by Springer Nature in Nature
- Vol. 410 (6829), 653-654
- https://doi.org/10.1038/35070650
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.Keywords
This publication has 12 references indexed in Scilit:
- Electronic mechanism of hardness enhancement in transition-metal carbonitridesNature, 1999
- High-densityandCrystalline structures and equations of statePhysical Review B, 1999
- On the rutile/α-PbO2-type phase boundary of TiO2Journal of Physics and Chemistry of Solids, 1999
- Transition-metal dioxides with a bulk modulus comparable to diamondPhysical Review B, 1998
- Discovery of hardest known oxideNature, 1996
- Carbon nitride and other speculative superhard materialsMaterials Chemistry and Physics, 1996
- Predicting properties and new materialsSolid State Communications, 1994
- Novel Ultrahard MaterialsAdvanced Materials, 1994
- Materials potentially harder than diamond: Quenchable high-pressure phases of transition metal dioxidesJournal of Materials Science Letters, 1994
- X-ray diffraction study of TiO2 up to 49 GPaPhysica B: Condensed Matter, 1993