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Kubicek, Markus [VerfasserIn]; Rupp, Ghislain M. [VerfasserIn]; Huber, Stefanie [VerfasserIn]; Penn, Alexander [VerfasserIn]; Opitz, Alexander K. [VerfasserIn]; Bernardi, Johannes [VerfasserIn]; Stöger-Pollach, Michael [VerfasserIn]; Hutter, Herbert [VerfasserIn]; Fleig, Jürgen [VerfasserIn]

Cation diffusion in La₀.₆Sr₀.₄CoO 3 - δ below 800 °C and its relevance for Sr segregation

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  • Medientyp: E-Artikel
  • Titel: Cation diffusion in La₀.₆Sr₀.₄CoO 3 - δ below 800 °C and its relevance for Sr segregation
  • Beteiligte: Kubicek, Markus [VerfasserIn]; Rupp, Ghislain M. [VerfasserIn]; Huber, Stefanie [VerfasserIn]; Penn, Alexander [VerfasserIn]; Opitz, Alexander K. [VerfasserIn]; Bernardi, Johannes [VerfasserIn]; Stöger-Pollach, Michael [VerfasserIn]; Hutter, Herbert [VerfasserIn]; Fleig, Jürgen [VerfasserIn]
  • Erschienen: 2013
  • Erschienen in: Physical chemistry, chemical physics ; 16(2014), 6, Seite 2715-2726
  • Sprache: Englisch
  • DOI: 10.15480/882.3515; 10.1039/c3cp51906f
  • ISSN: 1463-9084
  • Identifikator:
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: Cation diffusion was investigated in la₀.₆Sr₀.₄CoO 3 - δ (LSC) thin films on (100) yttria stabilized zirconia in the temperature range 625-800 °C. Isotopic ( 86Sr) and elemental tracers (Fe, Sm) were used to establish diffusion profiles of the cations in bi- and multi-layered thin films. The profiles were analyzed by time of flight-secondary ion mass spectrometry (ToF-SIMS). Grain and grain boundary diffusion coefficients of the cations were determined for LSC thin films with columnar grains-diffusion along grain boundaries is shown to be about three orders of magnitude faster than in grains. This could be verified for thin films with different grain size. A- and B-site cations showed very similar temperature dependencies with activation energies of ∼3.5 eV for bulk and ∼4.1 eV for grain boundary diffusion. The importance of cation diffusivities for surface segregation of Sr and thus for a major degradation mechanism of LSC cathodes in solid oxide fuel cells is discussed.
  • Zugangsstatus: Freier Zugang
  • Rechte-/Nutzungshinweise: Namensnennung (CC BY)