Structural and conductivity study of the proton conductor BaCe(0.9−x)ZrxY0.1O(3−δ) at intermediate temperatures

Sandrine Ricote, Nikolaos Bonanos, M.C. Marco de Lucas, G. Caboche

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    Abstract

    The perovskite BaCe(0.9−x)ZrxY0.1O(3−δ) is prepared by solid-state reaction at 1400 °C and sintering at 1700 °C. It is characterised using X-ray diffraction, Raman spectroscopy and electrical measurements. A distortion from the cubic structure at room temperature is noticeable in the Raman spectra for 0.2 <x <0.8, but not in the X-ray diffraction patterns. This work points out the rhombohedral nature of this distortion. Phase transitions are studied up to 600 °C. The direct current conductivity is measured as a function of oxygen partial pressure, and at a water vapour partial pressure of 0.015 atm. The total conductivity is resolved into an ionic and a p-type component using a fitting procedure appropriate to the assumed defect model. The first contribution is useful for estimating the proton transport number, while the value of the second one should not be too high not to deteriorate the electrodes performance.
    Original languageEnglish
    JournalJournal of Power Sources
    Volume193
    Issue number1
    Pages (from-to)189-193
    ISSN0378-7753
    DOIs
    Publication statusPublished - 2009

    Keywords

    • Solid Oxide Fuel Cells
    • Fuel Cells and hydrogen

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