H 65 High-temperature phase equilibria in the oxide systems SrFe1-xGaxO2.5-SrFe1-xGaxO3 (x = 0, 0.1, 0.2) [Text] / I. A. Leonidov, M. V. Patrakeev, J. A. Bahteeva, E. B. Mitberg, V. L. Kozhevnikov, Ph. Colomban, K. R. Poeppelmeier // Journal of Solid State Chemistry. - 2006. - Vol. 179, № 4. - P.1093-1099. - Bibliogr. : p. 1099 (17 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ФАЗОВЫЕ РАВНОВЕСИЯ -- СИСТЕМЫ ОКСИДНЫЕ -- ВЫСОКОТЕМПЕРАТУРНЫЕ ФАЗОВЫЕ ДИАГРАММЫ -- ГАЛЛИЙ -- ДОБАВКИ Аннотация: X-ray powder diffraction, Raman scattering, equilibrium oxygen content and conductivity data are combined to construct high-temperature phase diagrams (T vs. delta) for the oxide systems SrFe1-xGaxO2.5–SrFe1-xGaxO3, where , 0.1, and 0.2. Depending on oxygen content and gallium doping, three different structural types are shown to exist at high temperatures including cubic perovskite-, cubic brownmillerite-, and orthorhombic brownmillerite-type structures. Substitution of gallium for iron is shown to extend the oxygen content and temperature limits where the cubic brownmillerite-type phase is stable |