Conductivity and redox stability of new double perovskite oxide Sr1.6K0.4Fe1+xMo1−xO6−δ (x = 0.2, 0.4, 0.6)

Cowin, Peter I. and Lan, Rong and Petit, Christophe T G and Wang, Huanting and Tao, Shanwen (2016) Conductivity and redox stability of new double perovskite oxide Sr1.6K0.4Fe1+xMo1−xO6−δ (x = 0.2, 0.4, 0.6). Journal of Materials Science, 51 (8). pp. 4115-4124. ISSN 0022-2461 (https://doi.org/10.1007/s10853-016-9734-9)

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Abstract

A series of new perovskite oxides Sr1.6K0.4Fe1+xMo1−xO6−δ (x = 0.2, 0.4, 0.6) were synthesised by solid state reaction method. Synthesis of Sr1.6K0.4Fe1+xMo1−xO6−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+xMo1−xO6−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.

  • Item type:Article
    ID code:55496
    Dates:
    Date
    Event
    1 April 2016
    Published
    20 January 2016
    Published Online
    6 January 2016
    Accepted
    Keywords:SrMoO4, double perovskites, double perovskite oxide, fuel cell performance, iron molybdate, molybdenum, double perovskite structure, strontium, ionic conductivity, cathode material, solid state reaction, lattice parameter, carbon deposition, Engineering (General). Civil engineering (General), Materials Science(all), Mechanics of Materials, Mechanical Engineering
    Subjects:Technology > Engineering (General). Civil engineering (General)
    Department:Faculty of Engineering > Chemical and Process Engineering
    Depositing user: Pure Administrator
    Date deposited:09 Feb 2016 10:43
    Last modified:29 Jan 2023 03:34
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/55496
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