STUDY OF THE STRUCTURAL FEATURES OF NONSTOICHIOMETRIC SRCO0.8-XFE0.2WXO3-D (0 < X < 0.1) PEROVSKITES
E. V. Artimonova1, O. A. Savinskaya1, I. V. Belenkaya1, A. P. Nemudry1,2
1Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk National Research State University, Novosibirsk, Russia
Keywords: нестехиометрические перовскиты, наноструктурирование, керамические мембраны, nonstoichiometric perovskites, nanostructuring, ceramic membranes
Abstract
The work studies a partial tungsten substitution for cobalt in the structure of nonstoichiometric SrCo0.8Fe0.2O3-d (SCF) perovskite with mixed oxygen electron conductivity. It is shown that samples of the composition SrCo0.8- x Fe0.2W x O3-d (SCFW) at x ³ 0.03 undergo the endotaxial phase separation with the formation of nanosized domains with a structure of ordered Sr2CoWO6 double perovskite, which are distributed in the matrix of nonstoichiometric SrCo0.8- x Fe0.2W x O3-d perovskite. For the materials with 0.02 < x < 0.1, a decrease in the oxygen stoichiometry is accompanied by nanostructuring of the matrix: the formation of nanosized domains in which oxygen vacancies are ordered with the formation of the brownmillerite-like structure.
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