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The hardest known oxide

Author

Listed:
  • 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
    Imperial College London)

  • R. Ahuja

    (Condensed Matter Theory Group, Uppsala University)

  • B. Holm

    (Condensed Matter Theory Group, Uppsala University)

  • B. Johansson

    (Condensed Matter Theory Group, Uppsala University
    Applied Materials Physics, Royal Institute of Technology)

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.

Suggested Citation

  • L. S. Dubrovinsky & N. A. Dubrovinskaia & V. Swamy & J. Muscat & N. M. Harrison & R. Ahuja & B. Holm & B. Johansson, 2001. "The hardest known oxide," Nature, Nature, vol. 410(6829), pages 653-654, April.
    • Handle: RePEc:nat:nature:v:410:y:2001:i:6829:d:10.1038_35070650
    DOI: 10.1038/35070650
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