The project double perovskites as mixed ionic-electronic conductors is devoted to the synthesis and
characterization of a new class of highly ordered, chemically and structurally highly complex oxide
materials on strontium-iron-vanadium-niobium basis. The physical and chemical properties can be
directly steered by the synthesis routine and these materials therefore have the potential to substitute
current materials exploited in so-called solid-oxide fuel cells. The key parameter here is the structural
stability under the rather extreme temperature and chemical operating conditions of solid-oxide fuel
cells and in turn, the maintaining of the ionic and electronic conductivity under these harsh reaction
conditions. As we have the possibility to live monitor the changes of the physical and chemical
properties under typical operating conditions via the use of dedicated in situ methods, we expect
unprecedented insights into the structural and chemical behavior of these materials and the establishment
of direct structure-reactivity correlations.