Abstract The double perovskite-like solid solutions PrBaCo 2– x Al x O 6– 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 PrBaCo 1.9 Al 0.1 O 6– 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 AlO 6 octahedra in the crystal structure and enhanced disproportionation of Co 3+ 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 PrBaCo 1.9 Al 0.1 O 6– δ cobaltite in various high-temperature solid state electrochemical devices.

中文翻译：

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提高 PrBaCo 2-x Al x O 6-δ 的结构稳定性、电子传输和缺陷形成

摘要 双钙钛矿类固溶体PrBaCo 2– x Al x O 6– δ 是通过甘油-硝酸盐有机金属前驱体的燃烧获得的。铝掺杂的发生有利于在宽范围的温度变化下减轻热膨胀和稳定四方结构。PrBaCo 1.9 Al 0.1 O 6– δ 中平衡氧含量的变化是用库仑滴定技术测量的，并根据缺陷化学进行分析。结果表明，铝的掺入伴随着晶体结构中刚性 AlO 6 八面体的形成和 Co 3+ 阳离子的歧化增强。开发的缺陷模型已成功应用于解释电导率和热电势的数据。结构稳定性，