The hardest known oxide | Zendy

Leonid Dubrovinsky | Zendy; Natalia Dubrovinskaia | Zendy; Varghese Swamy | Zendy; J. Muscat | Zendy; N. M. Harrison | Zendy; Rajeev Ahuja | Zendy; B. Holm | Zendy; B. Johansson | Zendy

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The hardest known oxide

Author(s) -

Leonid Dubrovinsky,

Natalia Dubrovinskaia,

Varghese Swamy,

J. Muscat,

N. M. Harrison,

Rajeev Ahuja,

B. Holm,

B. Johansson

Publication year - 2001

Publication title -

nature

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 15.993

H-Index - 1226

eISSN - 1476-4687

pISSN - 0028-0836

DOI - 10.1038/35070650

Subject(s) - boron nitride , crystallite , oxide , titanium , nitride , diamond , materials science , phase (matter) , oxygen , crystallography , chemical engineering , chemistry , inorganic chemistry , nanotechnology , metallurgy , organic chemistry , layer (electronics) , engineering

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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