Abstract
Several recent publications have claimed that the oxygen exchange surface reaction is accelerated at hetero grain boundaries betwen La1-xSrxCoO3- d and (La1-ySry)2CoO4+ d. To investigate this effects in a greater detail, PLD films with a high density of such hetero grain boundaries are prepared from a two-phase target, and characteristic crystal morphologies are observed. The issue of preferential Sr accumulation in the (La1-ySry)2CoO4+ d Ruddlesden-Popper phase is exemplarily quantified for two-phase powder samples based on X-ray diffraction. The implications of this uneven Sr distribution (occurring similarly in the two-phase films) for the analysis of the oxygen exchange kinetics and quantification of the specific hetero grain boundary effect are discussed
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