Abstract.
Oxygen-deficient phases based on perovskite-like strontium cobaltites-ferrites are promising mixed conductors for high-temperature electrochemical applications. The p(O2)-T-δ diagrams for the oxide systems SrCo1– x – y Fe x Cr y O3– δ (x=0.10–0.40; y=0–0.05) were studied at 500–1000 °C in the oxygen pressure range from 10–5 to 0.21 atm using the coulometric titration technique and thermogravimetric analysis. Stability limits of the cubic perovskite phases having a high oxygen ionic conductivity were evaluated as functions of temperature, oxygen partial pressure and oxygen nonstoichiometry. It was found that doping with chromium and increasing the iron content in SrCo(Fe,Cr)O3– δ both lead to a considerable enlargement of the cubic perovskite phase existence domain towards lower temperatures and reduced oxygen pressures.
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Tikhonovich, .V., Naumovich, .E., Logvinovich, .D. et al. Oxygen deficiency and phase transitions in SrCo1– x – y Fe x Cr y O3– δ (x=0.10–0.40, y=0–0.05). J Solid State Electrochem 7, 77–82 (2003). https://doi.org/10.1007/s10008-002-0321-4
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DOI: https://doi.org/10.1007/s10008-002-0321-4