The Sr-free mixed ionic electronic conducting perovskites La_0.8Ca_0.2FeO_3-δ (LCF82) and Pr_0.8Ca_0.2FeO_3-δ (PCF82) were synthesized via a glycine-nitrate process. Crystal structure, phase purity, and lattice constants were determined by XRD and Rietveld analysis. The oxygen exchange kinetics and the electronic conductivity were obtained from in-situ dc-conductivity relaxation experiments at 600–800 °C and 1×10⁻³≤pO₂/bar≤0.1. Both LCF82 and PCF82 show exceptionally fast chemical surface exchange coefficients and chemical diffusion coefficients of oxygen. The oxygen nonstochiometry of LCF82 and PCF82 was determined by precision thermogravimetry. A point defect model was used to calculate the thermodynamic factors of oxygen and to estimate self-diffusion coefficients and ionic conductivities. Density Functional Theory (DFT) calculations on the crystal structure, oxygen vacancy formation as well as oxygen migration energies are in excellent agreement with the experimental values. Due to their favourable properties both LCF82 and PCF82 are of interest for applications in solid oxide fuel cell cathodes, solid oxide electrolyser cell anodes, oxygen separation membranes, catalysts, or electrochemical sensors.

自由锶混合离子电子传导的钙钛矿的La _0.8钙_0.2的FeO _3-δ（LCF82）和Pr _0.8钙_0.2的FeO _3-δ（PCF82）经甘氨酸-硝酸盐方法合成。通过XRD和Rietveld分析确定晶体结构，相纯度和晶格常数。氧交换动力学和电子传导性，从原位直流电导率松弛实验在600-800获得 ℃和1×10 ^-3 ≤pO ₂/bar≤0.1。LCF82和PCF82都显示出异常快的氧化学表面交换系数和化学扩散系数。LCF82和PCF82的氧非化学计量是通过精密热重法测定的。使用点缺陷模型计算氧气的热力学因子，并估计自扩散系数和离子电导率。密度泛函理论（DFT）对晶体结构，氧空位形成以及氧迁移能的计算与实验值非常吻合。由于它们的良好性能，LCF82和PCF82都适用于固体氧化物燃料电池阴极，固体氧化物电解池阳极，氧分离膜，催化剂或电化学传感器。