In situ investigation of A-site order/disorder phase transition induced by an electric field in NdBaCo2O5, a promising cathode material for
In situ neutron diffraction under electric field will be used to explore the phase transition transforming the A-site ordered tetragonal structure of NdBaCo2O5+d (a promising cathode material for SOFC) into a disordered cubic structure. Such experiments on LnBaCo2O5+d perovskites have not been investigated by diffraction techniques so far. The impact of the phase transition induced by the electric-field on the diffusion pathways of the O2- ions will be studied by means of the Maximum Entropy Method (MEM) analysis of the isothermal data collected on cooling under electric field combined to Molecular Dynamics calculations aiming to understand the role of A-site order/disorder phenomena on the oxygen diffusion process in a technologically important family of materials. The need for neutron diffraction lies in the sensitivity to the changes in the oxygen content induced by temperature and electric field. D20 will be used in its high take-off angle of 118° giving a wavelength of 1.3594 Å. Isothermal data will be collected at 100 °C intervals on cooling from 800 °C to room temperature.
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BAHOUT Mona; BROUX THIBAULT; HANLON James; Thomas C. Hansen; HERNANDEZ Olivier; MOLLON RUIZ Tamara; PAOFAI SERGE and Carmelo Prestipino. (2015). In situ investigation of A-site order/disorder phase transition induced by an electric field in NdBaCo2O5, a promising cathode material for. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-25-233
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