Baddeleyite-type high-pressure phase of TiO2

Details Baddeleyite-type high-pressure phase of TiO2 Baddeleyite-type high-pressure phase of TiO2

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...251..786s&link_type=abstract

Science (ISSN 0036-8075), vol. 251, Feb. 15, 1991, p. 786-788.

Physics

48

Phase Diagrams, Phase Transformations, Shock Waves, Titanium Oxides, X Ray Diffraction, Pressure Dependence, Sintering, Zirconium Oxides

Scientific paper

Many investigators have suggested that the high-pressure phase of TiO2 has a fluorite structure, in which a Ti atom is coordinated by eight O atoms. In situ XRD has been used in the present investigation to observe a high pressure phase of TiO2 created at 20 GPa and 770 C with sintered-diamond multianvils. The phase is found to have the same structure as the baddeleyite stable phase of ZrO2 at ambient conditions. The coordination number of Ti increases from 6 to 7 in the transition from rutile to baddeleyite, with 9-percent volume reduction.

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