ISSN:
1600-5767
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Geosciences
,
Physics
Notes:
The crystal structures of rutile (TiO2) and its high-pressure polymorphs have been studied by X-ray powder diffraction in the pressure range up to 60 GPa. At 12 GPa, rutile transforms to a phase with the baddeleyite (ZrO2) structure. Upon decompression, this phase transforms at 7 GPa to another phase with the α-PbO2 structure. At ambient conditions, the α-PbO2-type phase is 2.1 (3)% denser than rutile and the baddeleyite-type phase is 11.3 (9)% denser than rutile. In the pressure range of the rutile-to-baddeleyite transition, the difference in density between the two phases is 9.75 (15)%. The zero-pressure bulk moduli, as determined from the equation of state, are 230 (20), 260 (30) and 290 (20) GPa for rutile, the α-PbO2-type phase and the baddeleyite-type phase, respectively.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0021889896011454
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