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Elasticity of CaIrO3 with perovskite and post-perovskite structure

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Abstract

Compression behaviors of CaIrO3 with perovskite (Pv) and post-perovskite (pPv) structures have been investigated up to 31.0(1.0) and 35.3(1) GPa at room temperature, respectively, in a diamond-anvil cell with hydrostatic pressure media. CaIrO3 Pv and pPv phases were compressed with the axial compressibility of β a > β c > β b and β b > β a > β c, respectively and no phase transition was observed in both phases up to the highest pressure in the present study. The order of axial compressibility for pPv phase is consistent with the crystallographic consideration for layer structured materials and previous experimental results. On the other hand, Pv phase shows anomalous compression behavior in b axis, which exhibit constant or slightly expanded above 13 GPa, although the applied pressure remained hydrostatic. Volume difference between Pv and pPv phases was gradually decreased with increasing pressure and this is consistent with the results of theoretical study based on the ab initio calculation. Present results, combined with theoretical study, suggest that these complicate compression behaviors in CaIrO3 under high pressure might be caused by the partially filled electron of Ir4+. Special attention must be paid in case of using CaIrO3 as analog materials to MgSiO3, although CaIrO3 exhibits interesting physical properties under high pressure.

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Acknowledgments

The authors would like to thank T. Okada, A. Sano-Furukawa, M. Hasegawa and N. Funamori for their useful discussion. We also acknowledge the technical support of H. Gotou for high pressure synthesis and Y. Kiuchi for SEM–EDS operation. We would like to thank two anonymous reviewers for their improvement in our manuscript.

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Authors and Affiliations

  1. Institute for Solid State Physics, University of Tokyo, Kashiwa, 277-8581, Japan

    Ken Niwa, Takehiko Yagi & Kenya Ohgushi

  2. Department of Materials Science and Engineering, Nagoya University, Nagoya, Aichi, 464-8603, Japan

    Ken Niwa

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  1. Ken Niwa
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  2. Takehiko Yagi
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  3. Kenya Ohgushi
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Correspondence to Ken Niwa.

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Niwa, K., Yagi, T. & Ohgushi, K. Elasticity of CaIrO3 with perovskite and post-perovskite structure. Phys Chem Minerals 38, 21–31 (2011). https://doi.org/10.1007/s00269-010-0378-z

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