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Cation diffusion in La₀.₆Sr₀.₄CoO 3 - δ below 800 °C and its relevance for Sr segregation
Citation Link: https://doi.org/10.15480/882.3515
Publikationstyp
Journal Article
Publikationsdatum
2013-12-03
Sprache
English
TORE-URI
Enthalten in
Volume
16
Issue
6
Start Page
2715
End Page
2726
Citation
Physical Chemistry Chemical Physics 16 (6): 2715-2726 (2014-02-14)
Publisher DOI
Scopus ID
Publisher
RSC Publ.
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.
DDC Class
540: Chemie
620: Ingenieurwissenschaften
More Funding Information
Financial support from Austrian Science Fund (FWF) project P 21960-N17 is gratefully acknowledged.
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