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Electrical properties of the ordered oxygen-deficient perovskite Ca2Fe0.5Ga1.5O5

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Abstract

Ca2Fe0.5Ga1.5O5 is an oxygen-deficient perovskite, where the defects generated due to oxygen-deficiency are distributed in an ordered fashion. Neutron diffraction experiments indicate that the defect-order results in the formation of alternating (Ga)O4 tetrahedral and (FeGa)O6 octahedral units, forming the so-called brownmillerite-type structure. This material represents the highest degree of Ga-doping in the brownmillerite compound Ca2Fe2O5, which can be achieved using solid-state synthesis method. X-ray photoelectron spectroscopy (XPS) combined with iodometric titration was employed to determine the Fe oxidation state and the oxygen-content in Ca2Fe0.5Ga1.5O5. The XPS studies show that Fe is predominantly in trivalent state, and the iodometric titrations indicate that the oxygen stoichiometry is 5.07 per formula unit, consistent with primarily trivalent Fe. Variable-temperature electrical conductivity studies of Ca2Fe0.5Ga1.5O5 have been performed in a wide temperature range, 25–800 °C, indicating semiconducting behavior and significant contribution of ionic conductivity to total conductivity of this material.

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Acknowledgements

F.R. thanks the Conn Center for Renewable Energy Research and Jacek Jasinski for their help. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

Funding

This work is supported in part by the National Science Foundation under Cooperative Agreement No. 1355438.

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  1. Department of Chemistry, University of Louisville, Louisville, KY, 40292, USA

    Ram Krishna Hona & Farshid Ramezanipour

  2. Oak Ridge National Laboratory, Oak Ridge, TN, 37931, USA

    Ashfia Huq

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Correspondence to Farshid Ramezanipour.

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Hona, R.K., Huq, A. & Ramezanipour, F. Electrical properties of the ordered oxygen-deficient perovskite Ca2Fe0.5Ga1.5O5. Ionics 25, 1315–1321 (2019). https://doi.org/10.1007/s11581-018-2759-0

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