Cerium effect on the phase stability and redox properties of Ce-doped strontium ferrates (Articolo in rivista)

Type
Label
  • Cerium effect on the phase stability and redox properties of Ce-doped strontium ferrates (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • F. Deganello; L.F. Liotta; A. Longo; M. P. Casaletto; M. Scopelliti (2006)
    Cerium effect on the phase stability and redox properties of Ce-doped strontium ferrates
    in Journal of solid state chemistry (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • F. Deganello; L.F. Liotta; A. Longo; M. P. Casaletto; M. Scopelliti (literal)
Pagina inizio
  • 3406 (literal)
Pagina fine
  • 3419 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 179 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto per lo Studio dei Materiali Nanostrutturati del C.N.R, Sezione di Palermo, Via Ugo La Malfa 153, 90146-Palermo, Italy Dipartimento di Chimica Inorganica e Analitica''S. Cannizzaro'', Universita` di Palermo Parco d'Orleans, Viale delle Scienze, 90128-Palermo, Italy (literal)
Titolo
  • Cerium effect on the phase stability and redox properties of Ce-doped strontium ferrates (literal)
Abstract
  • Nanostructured perovskite-type Sr1àCeaFeO3?x, (0pao0.15) powders have been prepared by citrate-nitrate smoldering autocombustion. Their phase structure and stability, surface and morphological properties, reduction behavior and interaction with oxygen have been investigated by X-ray Powder Diffraction combined with Rietveld Analysis, 57Fe Mo¨ ssbauer and X-ray Photoelectron Spectroscopies, N2-adsorption method, Temperature Programmed Reduction and Oxidation experiments. Our results reveal that citrate-nitrate auto-combustion method is effective in obtaining single phase Sr1àCeaFeO3?x. The Sr1àCeaFeO3?x structure is cubic only for aX0.06, while for ao0.06 remains tetragonal. Moreover, for aX0.06 after semi-reductive treatment under inert gas, an expanded cubic phase is obtained instead of the brownmillerite-type structure, which is known to have ordered vacancies. Stabilization of octahedral Fe3+ by cerium doping appears to be the main factor in determining the structural properties of Sr1àCeaFeO3?x. The highest oxygen consumption for Ce-doped SrFeO3 occurs for a ¼ 0.06. Preliminary impedance measurements show that Sr0.94Ce0.06FeO3?x has the lowest area-specific resistance. (literal)
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