The performance and potential application of the cubic members of the La 4 Sr n-4 Ti n O 3n+2 series of compounds, i.e. n≥12, prepared by solid state reaction are discussed. Although these phases can be indexed as cubic perovskites by X-ray diffraction (XRD), there exists some oxygen beyond the ABO 3 stoichiometry accommodated in linear defects reminiscent to the oxygen rich layers in La 2 Ti 2 O 7. In the present work, we report preliminary fuel cell tests of the n=12,14 and 16 of the La 4 Sr n-4 Ti n O 3n+2 series, which reveal moderate responses under hydrogen, but also some promising results implying activation favouring methane oxidation. (La,Sr)TiO 3+δ en lugar de (La,Sr)TiO3+d En este trabajo se presentan las prestaciones y el potencial uso de las fases cúbicas de la serie homóloga con fórmula La 4 Sr n-4 Ti n O 3n+2 (n≥12) preparadas por reacción en el estado sólido. A pesar de que estas fases pueden describirse como perovskitas cúbicas mediante difracción de rayos-X (DRX), existe una cantidad de oxígeno superestequiométrico respecto a la composición ideal de la perovskita ABO 3 localizado en defectos lineales análogos a las capas ricas en oxígeno en La 2 Ti 2 O 7. En el presente trabajo, se muestran ensayos en pilas de combustible realizados en las composiciones n=12,14 and 16 de la serie La 4 Sr n-4 Ti n O 3n+2 , donde se muestran respuestas moderadas en hidrógeno, así como una cierta activación que favorece la oxidación del metano.
Atomic force microscopy and electron microscopy with energy dispersive X-ray analysis was used to characterize changes in the structure and composition of La 0.8 Sr 0.2 MnO 3 ͑LSM͒ nanoparticles supported on single crystal YSZ͑100͒ ͑yttria-stabilized zirconia͒ and SrTiO 3 ͑100͒ surfaces as a function of temperature and exposure to oxidizing and reducing environments. On YSZ͑100͒, LSM particles were found to decompose into Mn-and La-rich phases and spread over the surface upon calcination in air at temperatures above 1123 K. The Mn-rich phase was observed to have a higher mobility and spread more rapidly. In contrast to YSZ͑100͒, on SrTiO 3 ͑100͒ the LSM particles underwent agglomeration via an Ostwald ripening mechanism upon calcination at temperatures above 1123 K, resulting in an increase in the particle size. Phase separation was not observed on this substrate.
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