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Thermodynamic properties of MgSiO3 ilmenite from vibrational spectra

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Abstract

Unpolarized infrared (IR) reflectance spectra for MgSiO3 ilmenite taken from a single-crystal and from a densly packed polycrystalline sample possessed all eight peaks mandated by symmetry between 337 and 850 cm−1. Polarizations were inferred from intensity differences between the two samples. IR peak positions differ by up to 250 cm−1 from recent calculations, but on average are within 11%. Heat capacity C p calculated from these data by using a Kieffer-type model are within the experimental uncertainty of calorimetric measurements from 170 to 700 K. Outside this range, calculated C p is probably accurate within a few percent, based on recent results for garnets. Calculated entropy is only slightly less accurate, giving S 0(298.15 K) as 54.1 ±0.5 J/ mol-K, which is 10% lower than recent estimates based on phase equilibria. The slope of the phase boundary between ilmenite and perovskite is used to predict S 0(298.15 K) of perovskite as 58.7 ±1.4 J/mol-K, which is 10% lower than previous values.

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Authors and Affiliations

  1. Department of Geology, University of California, 95616, Davis, CA, USA

    Anne M. Hofmeister

  2. Institute for Study of the Earth's Interior, Okayama University, Misasa, 682-02, Tottori-ken, Japan

    Eiji Ito

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  1. Anne M. Hofmeister
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  2. Eiji Ito
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Hofmeister, A.M., Ito, E. Thermodynamic properties of MgSiO3 ilmenite from vibrational spectra. Phys Chem Minerals 18, 423–432 (1992). https://doi.org/10.1007/BF00200965

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