Ba2(Fe1−xInx)2O5 was prepared by a solid‐state reaction under a N2 flow. It was revealed that the solid solutions had a cubic perovskite structure with disordered oxygen vacancies at room temperature. Thermogravimetry and X‐ray diffraction measurements revealed that Ba2(Fe1−xInx)2O5 can reversibly react with CO2. It was found that the equilibrium temperature of the reaction could be controlled by preparing solid solution.
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