Abstract
Ten samples across the range of oxygen nonstoichometry of the ErBa2FeIII3O8 triple perovskite were obtained by high-temperature equilibration and quenching from flowing gas of controlled oxygen partial pressure. The crystal structure accommodating additional oxygen upon oxidation, and oxygen vacancies in the central coordination octahedron upon reduction, was studied by synchrotron X-ray powder diffraction. Close to the homogeneity limit upon reduction, the tetragonal P4/mmm structure distorts orthorhombic upon ordering of vacancies. The structural compromises across the nonstoichiometry range are discussed in terms of bond-valence sums at the atoms.
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