'In-situ' NPD study of the topotactic oxidation-reduction between SrMoO3-doped perovskite SOFC anode materials and SrMoO4 scheelites.
SrMo1-xMxO3-d (M= Fe and Cr; x= 0.1 and 0.2 and M=Ga, Al; x=0.1) perovskite phases perform successfully as anodes for solid-oxide fuel cells (SOFC), presenting a mixed electronic and ionic conductivity, and advantageously replacing the conventional cermets for intermediate-temperature-SOFCs. These perovskites are stable in reducing conditions (H2 atmosphere), as required for anode materials; however the annealing of the perovskite oxides in air leads, reversibly, to scheelite-like oxides. The reversibility of the scheelite (oxidized) and perovskite (reduced) oxides is an essential requisite for the cycling and performance of the fuel cells. We aim to understand the oxidation and reduction processes from perovskite to scheelite and vice versa: may they be considered as topotactic? We propose to examine these transformations by heating in air the perovskites at increasing temperatures across the oxidation reaction, as well as to investigate “in-situ” the reduction of the scheelite, across the phase transition temperature. We expect to obtain accurate information on the rearrangement of both crystal structures upon oxidation-reduction, for the four mentioned families of materials.
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ALONSO Jose Antonio; CASCOS JIMENEZ Vanessa Amelia; FARAGO Bela; FERNANDEZ DIAZ Maria Teresa and C. A. López. (2015). 'In-situ' NPD study of the topotactic oxidation-reduction between SrMoO3-doped perovskite SOFC anode materials and SrMoO4 scheelites.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-21-1092
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