High-pressure phase transformations and isothermal compression in CaTiO3 (perovskite)

Details High-pressure phase transformations and isothermal compression in CaTiO3 (perovskite) High-pressure phase transformations and isothermal compression in CaTiO3 (perovskite)

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...43..244x&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 43, Issue 3, p. 244-252.

Physics

17

Scientific paper

A polycrystalline CaTiO3 (perovskite) was investigated under static pressures up to 38 GPa and temperatures up to 1000°C by using a diamond anvil pressure cell, a YAG laser, and the ruby fluorescence pressure calibration system. In situ x-ray diffraction data reveal that at room temperature, the orthorhombic CaTiO3(I) transforms into a hexagonal CaTiO3(II) at ~ 10 GPa with a volume of change of 1.6%. At 1000°C, the orthorhombic CaTiO3(I) first transforms into a tetragonal CaTiO3(III) at 8.5 GPa and then transforms further into a hexagonal CaTiO3(II') at ~ 15 GPa with molar volume changes of 0% and 1.6%, respectively. All three high-pressure polymorphs found in this study are nonquenchable.
Isothermal compressibility of the orthorhombic CaTiO3 was derived from measurements under truly hydrostatic environments (i.e., <= 10.4 GPa). By assuming K'0 = 5.6 obtained ultrasonically on SrTiO3 perovskite, the value of the bulk modulus (K0) was calculated with the Birch-Murnaghan equation to be 210 +/- 7 GPa.

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