The unstable temperature for Sr2Fe1.5−xNixMo0.5O6−δ materials in H2 decreases with the increase of Ni content. Egressed Ni particles were detected in samples with a higher Ni content (x > 0.1). Sr2Fe1.4Ni0.1Mo0.5O6−δ shows the highest electronic conductivity of 20.6 S cm−1 at 800 °C.
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