Fig. 4

Schematic of proposed mechanism of surface oxygen interaction. LaMnO₃-SrMnO₃-LaMnO₃ (LSL) interacts with oxygen by adsorbing oxygen atoms without significantly changing surface structure. SrMnO₃-LaMnO₃-LaMnO₃ (SLL) interaction with oxygen involves migration of the A-site Sr atoms to the surface to form Sr-O like bonds