Kubicek, MarkusMarkusKubicekRupp, Ghislain M.Ghislain M.RuppHuber, StefanieStefanieHuberPenn, AlexanderAlexanderPennOpitz, Alexander K.Alexander K.OpitzBernardi, JohannesJohannesBernardiStöger-Pollach, MichaelMichaelStöger-PollachHutter, HerbertHerbertHutterFleig, JürgenJürgenFleig2020-11-262020-11-262013-12-03Physical Chemistry Chemical Physics 16 (6): 2715-2726 (2014-02-14)http://hdl.handle.net/11420/8004Cation 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.en1463-90842013627152726RSC Publ.https://creativecommons.org/licenses/by/3.0/ChemieIngenieurwissenschaftenJournal Article10.15480/882.351510.1039/c3cp51906f10.15480/882.3515Journal Article