High-pressure behavior of MnGeO3 and CdGeO3 perovskites and the post-perovskite phase transition

Shigehiko Tateno, Kei Hirose, Nagayoshi Sata, Yasuo Ohishi

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Abstract

The stability and high-pressure behavior of perovskite structure in MnGeO3 and CdGeO3 were examined on the basis of in situ synchrotron X-ray diffraction measurements at high pressure and temperature in a laser-heated diamond-anvil cell. Results demonstrate that the structural distortion of orthorhombic MnGeO3 perovskite is enhanced with increasing pressure and it undergoes phase transition to a CaIrO3-type post-perovskite structure above 60 GPa at 1,800 K. A molar volume of the post-perovskite phase is smaller by 1.6% than that of perovskite at equivalent pressure. In contrast, the structure of CdGeO3 perovskite becomes less distorted from the ideal cubic perovskite structure with increasing pressure, and it is stable even at 110 GPa and 2,000 K. These results suggest that the phase transition to post-perovskite is induced by a large distortion of perovskite structure with increasing pressure.

Original languageEnglish
Pages (from-to)721-725
Number of pages5
JournalPhysics and Chemistry of Minerals
Volume32
Issue number10
DOIs
Publication statusPublished - Jan 2006
Externally publishedYes

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Keywords

  • Diamond-anvil cell
  • High-pressureexperiment
  • Perovskite
  • Phasetransition
  • Post-perovskite

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Materials Science(all)

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