Abstract
The double perovskite-like solid solutions PrBaCo2–xAlxO6–δ are obtained via combustion of glycerol-nitrate organo-metallic precursors. The aluminum doping occurs favorable for mitigation of thermal expansion and stabilization of the tetragonal structure in a wide range of temperature changes. The variations of equilibrium oxygen content in PrBaCo1.9Al0.1O6–δ are measured with a coulometric titration technique, and analyzed in terms of defect chemistry. It is shown that aluminum incorporation is accompanied by formation of rigid AlO6 octahedra in the crystal structure and enhanced disproportionation of Co3+ cations. The developed defect model is successfully applied in order to explain the data for conductivity and thermopower. The structural stability, moderate thermal expansion and high conductivity represent an advantageous properties combination for the using of PrBaCo1.9Al0.1O6–δ cobaltite in various high-temperature solid state electrochemical devices.
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