title: Structural and microstructural characterization and properties of new phases in the Nd-Sr-Co-(Fe/Mn)-O system as air-electrodes in SOFCs.
abstract: New oxides of the (NdSr)n+1MO3n+1(M = Co and Mn or Fe) series are reported. Compounds of composition NdSrCo0.75Fe0.25O4.10, NdSrCo0.75Mn0.25O4.08and Nd0.5Sr1.5Co0.75Mn0.25O3.86are the n = 1 members of the Ruddlesden-Popper homologous series (K2NiF4structural type) as determined by X-ray diffraction and different transmission electron microscopy techniques. Their crystal structure consists of connected (Co-Fe/Mn)O6octahedra blocks separated by (Nd/Sr)O rock-salt like layers along the c-axis. Interstitial oxygen atoms or anion vacancies are induced depending on composition. Oxides with interstitial oxygen show good performances as intermediate temperature solid oxide fuel cell (IT-SOFC) cathode. The area-specific resistance values of electrodes made of these oxides at 973 K in air are 0.18 Ω cm2for NdSrCo0.75Fe0.25O4.10and NdSrCo0.75Mn0.25O4.08(comparable to the one of the state-of-the-art materials proposed as cathodes in IT-SOFC), and 1.38 Ω cm2for Nd0.5Sr1.5Co0.75Mn0.25O3.86.
authors.affiliation: Departamento de Química Inorgánica, Facultad Ciencias Químicas, Universidad Complutense, E-28040 Madrid, Spain.
authors.forename: K
authors.identifier: http://orcid.org/0000-0001-9912-5329
authors.initials: K
authors.lastname: Boulahya
authors.affiliation: Departamento de Química Inorgánica, Facultad Ciencias Químicas, Universidad Complutense, E-28040 Madrid, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Muñoz Gil
authors.affiliation: Departamento de Química Inorgánica, Facultad Ciencias Químicas, Universidad Complutense, E-28040 Madrid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Hassan
authors.affiliation: Departamento de Química Inorgánica, Facultad Ciencias Químicas, Universidad Complutense, E-28040 Madrid, Spain.
authors.forename: S
authors.initials: S
authors.lastname: García Martin
authors.affiliation: Departamento de Química, Facultad de Farmacia, Universidad CEU San Pablo, Urb. Montepríncipe, Boadilla del Monte, E-28668, Madrid, Spain. uamador@ceu.es.
authors.forename: U
authors.identifier: http://orcid.org/0000-0002-4412-2419
authors.initials: U
authors.lastname: Amador