Synthesis and structural studies of Sr2Co2-xAlxO5, 0.3 <= x <= 0. 5

摘要

Sr2Co2-xAlxO5, 0.3 less than or equal to x less than or equal to 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 Sr2Co2-xAlxO5 consist of small intergrown differently oriented domains, about 40Angstrom in diameter, with brownmillerite structure. (C) 2004 Elsevier Inc. All rights reserved.