Local oxygen ordering in a new oxygen deficient perovskite, explored by atomic pair distribution function analysis
Sr2SCGaO5, an oxygen deficient perovskite, is a new pure 3D oxygen electrolyte,particularly interesting in the intermediate temperature range. It crystalises in the cubic Pm-3m space group, showing 1/6 of all oxygen positions vacant. Previuos neutron diffraction experiments as a funtion of the temperature, revealed a strong anharmonic displacements for the oxygen atoms, while a predominant formation of ScO6 octahedra and GaO4 tetrahedra is indicated by Raman spectroscopic studies, resulting in a complex oxygen defect structure with short range order. The cubic structure thus might consist on an average level on small Brownmillerite orthorhombic type domains with random orientation. The aim of the proposed experiment is thus to verify via a PDF analysis that a local oxygen defect ordering exists for the average cubic Sr2ScGaO5 phase. The results are also important to understand the underlying activation energy and diffusion pathways of the oxygen atoms by specific lattice dynamics in these systems
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CERETTI Monica; BRUNELLI Michela; CUELLO Gabriel; MARSICANO Anna; PAULUS Werner and G. Perversi. (2018). Local oxygen ordering in a new oxygen deficient perovskite, explored by atomic pair distribution function analysis. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-06-480
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