Abstract
The double perovskite oxide Sr 2CrNbO 6 has a cubic structure according to powder X-ray diffraction. After reducing in CO, Sr 2CrNbO 6 still exhibited a cubic structure refined by Rietveld technique. The TG analysis indicated that Sr 2CrNbO 6 loses 0.127 oxygen per formula unit from 400 to 700 °C in H 2. The morphology and compositions of this ceramic did not significantly change on reduction. The conductivities in various atmospheres were varied from 0.015 to 0.039 S cm −1 at 800 °C. The conductivity exhibits a small oxygen partial pressure dependence in oxygen partial pressure range of 1–10 −16 atm, and this may be interpreted to reflect slow equilibration kinetics with decreasing oxygen activity.
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