Conductivity and redox stability of new double perovskite oxide Sr 1.6 K 0.4 Fe 1+ x Mo 1− x O 6− δ (x= 0.2, 0.4, 0.6)

Peter I Cowin, Rong Lan, Christophe TG Petit Petit, Huanting Wang, Shanwen Tao

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    Abstract

    A series of new perovskite oxides Sr1.6K0.4Fe1+x Mo1−x O6−δ (x = 0.2, 0.4, 0.6) were synthesised by solid state reaction method. Synthesis of Sr1.6K0.4Fe1+x Mo1−x O6−δ (x = 0.2, 0.4, 0.6) was achieved above 700 °C in 5 % H2/Ar, albeit with the formation of impurity phases. Phase stability upon redox cycling was only observed for sample Sr1.6K0.4Fe1.4Mo0.6O6−δ. Redox cycling of Sr1.6K0.4Fe1+x Mo1−x O6−δ (x = 0.2, 0.4, 0.6) demonstrates a strong dependence on high temperature reduction to achieve high conductivities. After the initial reduction at 1200 °C in 5 %H2/Ar, then re-oxidation in air at 700 °C and further reduction at 700 °C in 5 %H2/Ar, the attained conductivities were between 0.1 and 58.4 % of the initial conductivity after reduction 1200 °C in 5 %H2/Ar depending on the composition. In the investigated new oxides, sample Sr1.6K0.4Fe1.4Mo0.6O6−δ is most redox stable also retains reasonably high electrical conductivity, ~70 S/cm after reduction at 1200 °C and 2–3 S/cm after redox cycling at 700 °C, indicating it is a potential anode for SOFCs.
    Original languageEnglish
    Pages (from-to)4115-4124
    Number of pages10
    JournalJournal of Materials Science
    Volume51
    Issue number8
    Early online date20 Jan 2016
    DOIs
    Publication statusPublished - Apr 2016

    Bibliographical note

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    Keywords

    • Perovskite
    • Redox Cycling
    • Perovskite Oxide
    • SrMoO4
    • Double Perovskite

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