Abstract
Sr 2Co 2− x Al x O 5, 0.3⩽ x⩽0.5, with a perovskite related structure has been synthesized. The XRD powder patterns showed reflections from the basic cubic perovskite structure along with some additional weak superstructure reflections. Electron diffraction (ED) and high-resolution transmission electron microscopy (HRTEM) studies show that crystallites of Sr 2Co 2− x Al x O 5 consist of small intergrown differently oriented domains, about 40 Å in diameter, with brownmillerite structure.
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