3 ? δ — SrMnO3 ? δ]]>

摘要

Abstract Perovskite oxides are considered promising redox materials for many fields of application, such as chemical looping processes for thermochemical air separation, oxygen pumping and fuel production, in particular considering a solar heat source. The large range of possible perovskite compositions can be extended by the synthesis of solid solutions between different perovskite phases. In this work, the solid solution formation in the system SrMn1?xFexO3?δ is evaluated, showing that SrFeO3?δ and SrMnO3?δ are miscible in any ratio investigated. Moreover, redox thermodynamics were studied using a van't Hoff approach. It has been found that in mixed manganese ferrite perovskites, the reduction of Fe4+ is preferred over the reduction of Mn4+, leading to an increase in redox enthalpy and entropy when both species are reduced. Our findings allow the targeted synthesis of perovskites with superior redox properties for applications in chemical looping processes, as the redox thermodynamics are adjustable via variation of the Fe content. Highlights ? SrFeO3?δ and SrMnO3?δ form perovskite solid solutions in any mixture ratio. ? Reductive phase transitions to cubic perovskite structures observed for high Mn content phases ? Redox thermodynamics of SrFeO3?δ-SrMnO3?δ solid solutions studied and reduction enthalpies determined. ? Preferential Fe4+ reduction before Mn4+ reduction was observed. ? The studied materials can be applied for thermochemical air separation, oxygen storage and pumping. ]]>