Baddeleyite-type high-pressure phase of TiO2
Abstract
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.
- Publication:
-
Science
- Pub Date:
- February 1991
- DOI:
- 10.1126/science.251.4995.786
- Bibcode:
- 1991Sci...251..786S
- Keywords:
-
- Phase Diagrams;
- Phase Transformations;
- Shock Waves;
- Titanium Oxides;
- X Ray Diffraction;
- Pressure Dependence;
- Sintering;
- Zirconium Oxides;
- Lunar and Planetary Exploration