A combinatorial approach to synthesis of the La0.8Sr0.2Co1−yMnyO3±δ family of perovskite-type mixed conducting metal oxides and characterisation of the surface oxygen mobility

Abstract: The mixed conducting perovskite-type La0.8Sr0.2Co1− y MnyO3±δ family has been synthesised by a combinatorial method. This system including the two end member materials (y=0 and 1) have been studied using temperature programmed methods in order to relate structure and composition to oxygen exchange under a hydrogen atmosphere. Oxygen is removed in two steps: firstly, labile surface oxygen from 350 to 450°C and then more strongly bound lattice oxygen. A relationship between the B-site manganese and cobalt content and ease of removal of lattice oxygen was demonstrated over the temperature range of 600–820°C. Removal of labile surface oxygen was independent of the B-site composition but associated with A-site cations on the external surface of the crystallites. [Copyright &y& Elsevier]