Crystallography and oxygen mobility in novel mixed-conducting perovskites for SOFC cathodes
Recently, a theoretical study has determined that new compositions with perovskite structure could be considered as potential cathodes with high oxygen activity for solid oxide fuel cells. In our work, we have synthesized four of these new phases: Ba0.75Sr0.25Fe0.875Ga0.125O3-¿, BaFe0.75Ta0.25O3-¿, BaFe0.875Re0.125O3-¿ and SrCo0.9Sc0.1O3-¿. Impedance spectroscopy measurements of the sintered pellets and the symmetrical cells reveal evidence of mixed ionic and electronic conduction in the proposed materials, showing a promising behaviour for application is SOFCs. In this neutron thermodifraccion experiment, we would like to identify the connection between the electrical properties and the structural features of these compounds, such as the temperature dependence of the oxygen content, possible cation and/or oxygen vacancies ordering in the sample and the thermal parameters. We consider that 3 days of beamtime at D2B diffractometer are necessary to complete the study.
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CASCOS JIMENEZ Vanessa Amelia; ALONSO Jose Antonio; FERNANDEZ DIAZ Maria Teresa; Jesus Prado-Gonjal and SCHMIDT Rainer. (2021). Crystallography and oxygen mobility in novel mixed-conducting perovskites for SOFC cathodes. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-676
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