Abstract
The chemical and physical compatibility of SrCeO 3 is investigated with respect to La MO 3 ( M=Mn, Fe, Co) and La 2− x Sr x NiO 4 ( x=0, 0.8), via the reaction of fine-grained powder compacts and solid-state diffusion couples. Compositions were chosen so as to give predictive insight into possible candidate materials for all-oxide electrochemical devices. Results show the primary reaction in these systems to be the dissolution of SrO from SrCeO 3 into the La MO 3/La 2− x Sr x NiO 4, and corresponding formation of La-doped CeO 2. Reaction kinetics are observed to be relatively fast, with element profiles suggesting the diffusion of Sr 2+ in ceria to be surprisingly rapid. It is demonstrated that perovskite starting materials represent poor candidates for use with SrCeO 3, reacting completely to form Ruddlesden-Popper/K 2NiF 4 type oxides. Reaction with La 2NiO 4 is less pronounced, and formation of secondary phases suppressed for the composition La 1.2Sr 0.8NiO 4. It is thus concluded that Ruddlesden-Popper type oxides represent good candidate materials for use with a SrCeO 3-based electrolytes when doped with appropriate levels of Sr.
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