The present work investigates the redox performance of Sr2FeMo0.6Ni0.4O6-δ (SFMN) double perovskite in the Reverse Water-Gas Shift Chemical Looping (RWGS-CL) reaction in the medium temperature range (700 °C). Previous studies conducted on the same material revealed that H2-reduction at temperatures above 800 °C leads to the exsolution of bimetallic Ni-Fe alloy particles and the formation of a highly oxygen deficient Ruddlesden-Popper (RP) phase. In the same study, Thermogravimetric (TGA) and Temperature Programmed Reduction (TPR) and Oxidation (TPO) analyses showed that the optimal reduction and oxidation temperatures for maximizing the CO yield are around 850 °C and 750 °C, respectively, and that the cycled material could work steadily under isothermal conditions at 850 °C.