The CaFe0.1Mn0.9O3−δ0 oxide can reversibly release oxygen over a relatively wide range of temperatures and oxygen partial pressures and its favourable thermodynamic properties make it a promising candidate for thermochemical heat storage.

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The combination of high thermal stability, rapid kinetics, moderate enthalpy of reduction, and large entropy of reduction in the perovskite CaTi 0.5 Mn 0.5 O 3-d enables an outstanding thermochemical hydrogen productivity of 10.0 mL g À1 at a thermal reduction temperature of just 1,350 C and a short cycle time of 1.5 h.