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Chinese Journal of High Pressure Physics  > 1988  >  2(1): 1-9 .
XIONG Da-He, B. C. Ming, M. H. Manghnani. High-Pressure Phase Transition and Constant-Temperature Compression of Caiclum Titanate Ore[J]. Chinese Journal of High Pressure Physics, 1988, 2(1): 1-9 . doi: 10.11858/gywlxb.1988.01.001
Citation: XIONG Da-He, B. C. Ming, M. H. Manghnani. High-Pressure Phase Transition and Constant-Temperature Compression of Caiclum Titanate Ore[J]. Chinese Journal of High Pressure Physics, 1988, 2(1): 1-9 . doi: 10.11858/gywlxb.1988.01.001
shu

High-Pressure Phase Transition and Constant-Temperature Compression of Caiclum Titanate Ore

doi: 10.11858/gywlxb.1988.01.001
  • 1.

    Institute of Geology, Chinese Academy of Sciences, Beijing 100029, China;

  • 2.

    Hawaii Institute of Geophysics

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  • Corresponding author: XIONG Da-He
  • Received Date: 08 Aug 1986
  • Rev Recd Date: 08 Aug 1986
  • Publish Date: 05 Mar 1988
    Abstract
  • By using a diamond anvil cell with ruby fluorescence pressure calibration system and aYAG laser, polyerystalline GaTiO3 (perovskite) was investigated under static pressure up to 38 GPa and temperature up to 1 000 ℃. In situ X-ray diffration data reveals that at room temperature, orthorhombic GaTiO3(Ⅰ) transforms into hexagonal GaTiO3(Ⅱ) at 10 GPa with a volume change of 1.6%; at 1 000 ℃ and non-hydrostatic environment, orthorhombic GaTiO3(Ⅰ) transforms into tetragonal GaTiO3(Ⅲ) at 8.5 GPa and then into hexagonal GaTiO3(Ⅱ') at 15 GPa with volume changes of 0% and 1.6% respectively. All these three high pressure polymorphs occured in the study are nonquenchable. The isothermal compression of orthorhombic GaTiO3 was performed under standard hydrostatic environment with pressures not greater than 10.4 GPa. By assuming K0'=5.6, which was obtained on SrTiO3 perovskite ultrasonically, the value of bulk modulus K0 was calculated to be (2107)GPa by using Birch-Murnaghan equation.

     

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