Crescita e caratterizzazione di cristalli singoli di ossidi perovskitici difettivi

Oxides with high oxygen ionic transport and high electronic conductivity have attracted considerable attention in the last decade. This is mainly related to their potential application as electrodes for solid oxide fuel cells or batteries, membranes for oxygen separation and electrocatalysis. For this reason an intensive search for new oxides showing high oxygen mobility already at moderate temperatures has been stimulated. In this respect, nonstoichiometric perovskite-type oxides are particularly interesting as they are able to undergo a reversible topotactic oxygen intercalation reaction via electrochemical oxidation in an aqueous alkaline electrolyte already at room temperature. Until now many research groups published the structural evolution of Sr(Fe,Co)O2.5 in the form of powder. In this context, for the first time, we make a attempt to see the In situ structural evolution of single crystal of Sr(Fe,Co)O2.5 with up taking of oxygen with the variation of temperature by using ID11 beam line at ESRF.