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• W2003991738 abstract "Effects of calcium doping on the structure, dimensional stability, and mixed oxygen-ion and electron conductivity of perovskite-like La0.5Sr0.5 − xCaxFeO3 − δ (x = 0–0.3) were studied in light of potential membrane applications. The incorporation of relatively small Ca2 + cations into the lanthanum-strontium ferrite lattice decreases unit cell volume, oxygen nonstoichiometry variations and chemical contribution to the thermal expansion in air. These changes correlate with rising tendency to local oxygen-vacancy ordering and the formation of nano-sized domains with the brownmillerite and LaCa2Fe3O8-type lattices, as revealed by electron diffraction. The resultant vacancy trapping, changing domain structure and enlargement of the interfacial boundary area lead to non-linear relationships between the partial ion conductivity and cation composition, while the apparent activation energy for ion transport at temperatures below 900 °С remains almost constant, 0.6–0.7 eV. The n-type electron contribution to the total conductivity, measured in the oxygen pressure range 10− 20–0.5 atm at 700–950 °С, is also essentially independent of the calcium concentration." @default.
• W2003991738 created "2016-06-24" @default.
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• W2003991738 date "2014-09-01" @default.
• W2003991738 modified "2023-09-23" @default.
• W2003991738 title "Structure and transport properties of La0.5Sr0.5−xCaxFeO3−δ" @default.
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• W2003991738 doi "https://doi.org/10.1016/j.ssi.2013.11.050" @default.
• W2003991738 hasPublicationYear "2014" @default.
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