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High-pressure high-temperature phase relations in FeTiO3 up to 35 GPa and 1600 °C

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Abstract

Phase relations in FeTiO3 were precisely determined at 25–35 GPa and 600–1600 °C using multianvil high-pressure experiments with tungsten carbide anvils. Pressure generation up to about 36 GPa at 1600 °C was evaluated using Al2O3 solubility in MgSiO3 perovskite (Pv) in the system MgSiO3–Al2O3. At about 28 GPa, FeTiO3 Pv dissociates into an assemblage of calcium titanate (CT)-type Fe2TiO4 + orthorhombic-I (OI)-type TiO2 below 1200 °C. However, above 1200 °C at 28 GPa, FeTiO3 Pv decomposes into a new, denser phase assemblage of CT-type Fe2TiO4 + a new compound of FeTi2O5. The new phase FeTi2O5 was recovered as an amorphous phase at 1 atm. In situ X-ray diffraction experiments at 35.1 GPa indicated that the new phase (N-p) FeTi2O5 has orthorhombic symmetry with cell parameters a = 8.567(2) Å, b = 5.753(1) Å and c = 5.257(1) Å. In addition, the assemblage of CT-type Fe2TiO4 + OI-type TiO2 changes to FeO wüstite (Wu) + OI-type TiO2 at about 33 GPa below 1000 °C. The phase assemblages in FeTiO3 are denser in the order: FeTiO3 (Pv) → 1/2Fe2TiO4 (CT) + 1/2TiO2 (OI) → 1/3Fe2TiO4 (CT) + 1/3FeTi2O5 (N-p) → FeO (Wu) + TiO2 (OI). Our results indicate that the upper stability limit of FeTiO3 Pv is about 28 GPa at 600–1600 °C. This puts a constraint on peak shock pressure for formation of naturally discovered lithium niobate-type FeTiO3 which was interpreted to be retrograde transition product of FeTiO3 Pv on release of shock pressure.

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Acknowledgments

We are grateful to K. Takemura and T. Katsura for useful suggestions and K. Oka for his help in X-ray diffraction experiments. Constructive comments by anonymous reviewers were useful to improve the manuscript. Synchrotron X-ray diffraction experiments were performed under SPring-8 proposals (Nos. 2014B1492, 2015A1200, 2015A1204, 2015B1157). This work was supported in part by JSPS grants (No. 25287145 to M. A., No. 25106006 to H. Y. and No. 15H04128 to Y. I.) and by the MEXT-supported program for the Strategic Research Foundation at Private Universities.

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Authors and Affiliations

  1. Department of Chemistry, Gakushuin University, Mejiro, Toshima-ku, Tokyo, 171-8588, Japan

    M. Akaogi, K. Abe, T. Ishii, T. Tajima, H. Kojitani, D. Mori & Y. Inaguma

  2. National Institute for Materials Science, Namiki, Tsukuba, 305-0044, Japan

    H. Yusa

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  1. M. Akaogi
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  3. H. Yusa
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Correspondence to M. Akaogi.

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Akaogi, M., Abe, K., Yusa, H. et al. High-pressure high-temperature phase relations in FeTiO3 up to 35 GPa and 1600 °C. Phys Chem Minerals 44, 63–73 (2017). https://doi.org/10.1007/s00269-016-0836-3

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