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

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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.

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Acknowledgements

The in situ X-ray experiments were carried out at SPring-8 (proposal no. 2004A3013-LD2-np and 2004B4013-LD2-np). We thank Y. Kuwayama for his assistance in the Rietveld analysis. We are grateful to K. Kawamura for his constructive comments throughout this study. We also thank E. Takahashi for the use of the piston cylinder apparatus in his laboratory. The constructive reviews by R. Boehler and an anonymous referee were helpful in improving the manuscript. S.T. was supported by the 21st century COE program of the Japan Society for the Promotion of Science.

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Authors and Affiliations

  1. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, 152-8551, Meguro, Tokyo, Japan

    Shigehiko Tateno & Kei Hirose

  2. Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa, Japan

    Kei Hirose & Nagayoshi Sata

  3. Japan Synchrotron Radiation Research Institute, Mikazuki-cho, Sayo-gun, Hyogo, Japan

    Yasuo Ohishi

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  1. Shigehiko Tateno
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  2. Kei Hirose
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  3. Nagayoshi Sata
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  4. Yasuo Ohishi
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Correspondence to Shigehiko Tateno.

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Tateno, S., Hirose, K., Sata, N. et al. High-pressure behavior of MnGeO3 and CdGeO3 perovskites and the post-perovskite phase transition. Phys Chem Minerals 32, 721–725 (2006). https://doi.org/10.1007/s00269-005-0049-7

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  • DOI: https://doi.org/10.1007/s00269-005-0049-7

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