S 89 Structural features and enhanced high-temperature oxygen ion transport in SrFe1-xTaxO3-delta / A. A. Markov, E. V. Shalaeva, A. P. Tyutyunnik, V. V. Kuchin, M. V. Patrakeev, I. A. Leonidov, V. L. Kozhevnikov // Journal of Solid State Chemistry. - 2013. - Vol. 197. - P191-197 : il. - Bibliogr. : p. 197 (31 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ФЕРРИТ СТРОНЦИЯ -- ИОННЫЙ ПЕРЕНОС -- ПЕРОВСКИТЫ ДВОЙНЫЕ -- КИСЛОРОДНАЯ НЕСТЕХИОМЕТРИЯ Аннотация: Structural features, oxygen non-stoichiometry and transport properties are studied in the oxide series SrFe1−xTaxO3−δ, where x=0.2, 0.3 and 0.4. X-ray diffraction and electron microscopy data evidence formation of the inhomogeneous materials at x=0.3 and 0.4, which include phase constituents with a cubic perovskite and a double perovskite structure types. The composition, the amount and the typical grain size of the phase inhomogeneities are shown to depend both on doping and oxygen content. The increased oxygen-ion conductivity is observed in oxygen depleted materials, which is explained by the increase in the amount of cubic perovskite-like phase and development of interfacial pathways favorable for enhanced oxygen ion transport Полный текст |