RT Journal Article
T1 Strontium Superstoichiometry and Defect Structure of SrCeO3 Perovskite
A1 Mather, Glenn
A1 Figueiredo, Filipe
A1 Romero de Paz, Julio
A1 García Martín, Susana
AB Strontium cerate (SrCeO3) is the parent phase of a family of prototype proton-conducting perovskites with important potential applications as electrolytes in protonic ceramic fuel cells, hydrogen-separation membranes, and sensors for hydrogen and humidity. Apparent nonstoichiometric behavior and the microstructure of SrCeO3 have been investigated. Phase analysis by X-ray diffraction indicates that single-phase material in the system Sr1+xCeO3+d is obtained for compositions x = 0.02-0.03 and that nominally stoichiometric SrCeO3 (x= 0) synthesized by either solid-state reaction or the citrate method is Sr-rich. Selected area electron diffraction confirms that the system crystallizes with the GdFeO3-type orthorhombic perovskite structure (space group Pnma). Structural defects characterized by high-resolution transmission electron microscopy include twin domain boundaries and SrO-rich, Ruddlesden-Popper-type planar defects. Magnetic susceptibility measurements down to 2 K indicate that the Ce3+ content is minor (0.01 mol per formula unit for slow-cooled material) and does not influence the observed nonstoichiometry.
PB ACS
SN 0020-1669
YR 2008
FD 2008
LK https://hdl.handle.net/20.500.14352/96334
UL https://hdl.handle.net/20.500.14352/96334
LA eng
NO Mather, Glenn C., et al. «Strontium Superstoichiometry and Defect Structure of SrCeO 3 Perovskite». Inorganic Chemistry, vol. 47, n.o 3, febrero de 2008, pp. 921-29. https://doi.org/10.1021/ic701703c.
NO Ministerio de Educación y Ciencia (España)
NO Comunidad de Madrid
DS Docta Complutense
RD 7 abr 2025