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High-pressure phase behavior of MnTiO3: decomposition of perovskite into MnO and MnTi2O5

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Abstract

The phase relations and compression behavior of MnTiO3 perovskite were examined using a laser-heated diamond-anvil cell, X-ray diffraction, and analytical transmission electron microscopy. The results show that MnTiO3 perovskite becomes unstable and decomposes into MnO and orthorhombic MnTi2O5 phases at above 38 GPa and high temperature. This is the first example of ABO3 perovskite decomposing into AO + AB2O5 phases at high pressure. The compression behavior of volume, axes, and the tilting angle of TiO6 octahedron of MnTiO3 perovskite are consistent with those of other A2+B4+O3 perovskites, although no such decomposition was observed in other perovskites. FeTiO3 is also known to decompose into two phases, instead of transforming into the CaIrO3-type post-perovskite phase and we argue that one of the reasons for the peculiar behavior of titanate is the weak covalency of the Ti–O chemical bonds.

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Acknowledgments

The authors are grateful to Dr. H. Takei for providing the single crystal of ilmenite-type MnTiO3 used in the present study. Fruitful discussions with Drs. K. Ohgushi and K. Niwa are greatly appreciated. Critical reviews by two referees (Drs. K. Fujino and T. Sakai) were helpful in improving the manuscript. Several runs of high-pressure in situ X-ray experiments were conducted at the SPring-8 and Photon Factory under the auspices of proposals 2009B1238 and 08G042, respectively.

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  1. Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan

    Taku Okada, Takehiko Yagi & Daisuke Nishio-Hamane

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  1. Taku Okada
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  2. Takehiko Yagi
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  3. Daisuke Nishio-Hamane
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Correspondence to Taku Okada.

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Okada, T., Yagi, T. & Nishio-Hamane, D. High-pressure phase behavior of MnTiO3: decomposition of perovskite into MnO and MnTi2O5 . Phys Chem Minerals 38, 251–258 (2011). https://doi.org/10.1007/s00269-010-0400-5

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  • DOI: https://doi.org/10.1007/s00269-010-0400-5

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