Perovskite structured mixed metal oxides (ABO(3)) are one promising category of redox materials widely investigated for applications in various sustainable processes. In this study, we monitored the compositional and surface structural evolution of CaMnO3 under redox conditions at selected temperatures. The redox efficiency and stability of CaMnO3 was found to be temperature dependent. Despite enhanced sintering resistance and phase stability at 600 degrees C, the amount of oxygen release/uptake was low. At 750 degrees C, phase changes were found to diminish the redox efficiency in the long run. In contrast, at higher temperatures (900 degrees C) a stable oxygen uptake/release capacity was observed despite significant sintering and the associated structural and phase changes. The present study indicates that material composition and temperature determine the redox chemistry of CaMnO3 perovskite oxides. Interestingly, no noticeable amount of surface carbon deposition was detected under any stages of operation for this material.