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Preparation, properties, and reactivity of lanthanum strontium ferrite as an intermediate temperature SOFC cathode

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Abstract

Lanthanum strontium ferrite is a promising cathode material especially because of its chemical stability and thermal expansion compatibility with respect to zirconia-based electrolyte materials. La0.80Sr0.20FeO3 is synthesized by the gel-combustion technique using citric acid as the fuel. A phase-pure powder belonging to the perovskite structure is obtained at lower calcination temperature of 850 °C. The powders are tape-cast into tapes and detailed sintering studies are carried out between 1100 and 1450 °C and for different sintering durations. A thermal expansion coefficient of 11.65 ppm/°C from RT-1000 °C is measured for the sample sintered at 1450 °C for 6 h. The DC electrical conductivity is also measured for a number of samples having different sintered densities. Further, investigations on the chemical stability are demonstrated between this cathode and a scandia-doped zirconia electrolyte prepared in our laboratory.

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Acknowledgements

The authors thank National Science Foundation (NSF) and Oklahoma State University for the support provided for this work. Any opinions, findings, conclusions, or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.

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  1. School of Materials Science and Engineering, Oklahoma State University, 700 N. Greenwood Avenue, Tulsa, OK, 74106-0700, USA

    S. V. Chavan & R. N. Singh

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  1. S. V. Chavan
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  2. R. N. Singh
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Correspondence to R. N. Singh.

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Chavan, S.V., Singh, R.N. Preparation, properties, and reactivity of lanthanum strontium ferrite as an intermediate temperature SOFC cathode. J Mater Sci 48, 6597–6604 (2013). https://doi.org/10.1007/s10853-013-7456-9

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  • DOI: https://doi.org/10.1007/s10853-013-7456-9

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