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In situ observation of a garnet/perovskite transition in CaGeO3

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Abstract

We used an in situ measurement method to investigate the phase transition of CaGeO3 polymorphs under high pressures and temperatures. A multi-anvil high-pressure apparatus combined with intense synchrotron X-ray radiation was used. The transition boundary between a garnet and a perovskite phase at T = 900–1,650 K and P = 3–8 GPa was determined as occurring at P (GPa) = 9.0−0.0023 × T (K). The transition pressure determined in our study is in general agreement with that observed in previous high-pressure experiments. The slope, dP/dT, of the transition determined in our study is consistent with that calculated from calorimetry data.

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Acknowledgments

The authors thank A. Suzuki, K. Mibe, and T. Kawamoto for their help in carrying out the experiments. The synchrotron radiation experiments were performed at the NE7A, KEK (Proposal No. 2009G508) and BL04B1, SPring-8 (Proposal No. 2008A1090). This work was partially supported by Grants-in-Aid for Scientific Research from JSPS and the Earthquake Research Institute cooperative research program, Japan.

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Authors and Affiliations

  1. Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka-shi, Kanagawa, 237-0061, Japan

    Shigeaki Ono

  2. Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan

    Shigeaki Ono

  3. High Energy Acceleration Research Organization, 1-1 Oho, Tsukuba, 305-0801, Japan

    Takumi Kikegawa

  4. Japan Synchrotron Radiation Research Institute, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan

    Yuji Higo

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  1. Shigeaki Ono
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  2. Takumi Kikegawa
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  3. Yuji Higo
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Correspondence to Shigeaki Ono.

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Ono, S., Kikegawa, T. & Higo, Y. In situ observation of a garnet/perovskite transition in CaGeO3 . Phys Chem Minerals 38, 735–740 (2011). https://doi.org/10.1007/s00269-011-0446-z

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  • DOI: https://doi.org/10.1007/s00269-011-0446-z

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