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Low-temperature heat capacities, entropies and high-pressure phase relations of MgSiO3 ilmenite and perovskite

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Abstract

Low-temperature isobaric heat capacities (C p ) of MgSiO3 ilmenite and perovskite were measured in the temperature range of 1.9–302.4 K with a thermal relaxation method using the Physical Properties Measurement System. The measured C p of perovskite was higher than that of ilmenite in the whole temperature range studied. From the measured C p , standard entropies at 298.15 K of MgSiO3 ilmenite and perovskite were determined to be 53.7 ± 0.4 and 57.9 ± 0.3 J/mol K, respectively. The positive entropy change (4.2 ± 0.5 J/mol K) of the ilmenite–perovskite transition in MgSiO3 is compatible with structural change across the transition in which coordination of Mg atoms is changed from sixfold to eightfold. Calculation of the ilmenite–perovskite transition boundary using the measured entropies and published enthalpy data gives an equilibrium transition boundary at about 20–23 GPa at 1,000–2,000 K with a Clapeyron slope of −2.4 ± 0.4 MPa/K at 1,600 K. The calculated boundary is almost consistent within the errors with those determined by high-pressure high-temperature in situ X-ray diffraction experiments.

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Acknowledgments

We are grateful to M. Ozima for kindly providing orthoenstatite crystals, and to T. Tsuchiya and J. Tsuchiya for discussion and sending us numerical data of heat capacities of MgSiO3 perovskite in their paper. We thank T. Ikeda and an anonymous reviewer for constructive comments, and M. Matsui for editorial handling. This work was supported in part with the Grants-in-Aid (Nos. 1520404 and 19340166 to M.A.) from the Japan Society for the Promotion of Science.

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Authors and Affiliations

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

    M. Akaogi, H. Kojitani & T. Morita

  2. Materials and Structures Laboratory, Tokyo Institute of Technology, Nagatsuta-cho, Yokohama, 226-8503, Japan

    H. Kawaji & T. Atake

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  1. M. Akaogi
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Correspondence to M. Akaogi.

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Akaogi, M., Kojitani, H., Morita, T. et al. Low-temperature heat capacities, entropies and high-pressure phase relations of MgSiO3 ilmenite and perovskite. Phys Chem Minerals 35, 287–297 (2008). https://doi.org/10.1007/s00269-008-0222-x

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