Solid-state dewetting of La 0.6Sr 0.4Co 0.2Fe 0.8O 3± δ thin films during annealing

Porous La 0.6Sr 0.4Co 0.2Fe 0.8O 3± δ (LSCF) thin film cathodes were fabricated by spray pyrolysis and pulsed laser deposition (PLD). These films show nanometer sized grains and a thickness <1 μm. They are dense after deposition and develop porosity upon annealing at 600–900 °C. Sprayed films dev...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 28; no. 1; pp. 49 - 60
Main Authors Beckel, Daniel, Dubach, Alban, Grundy, A. Nicholas, Infortuna, Anna, Gauckler, Ludwig J.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 2008
Subjects
(La,Sr)(Co,Fe)O 3
Grain size
Microstructure-final
Perovskites
Porosity
Grain size
Microstructure-final
Films
(La,Sr)(Co,Fe)O 3
Perovskites
Porosity
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Summary:Porous La 0.6Sr 0.4Co 0.2Fe 0.8O 3± δ (LSCF) thin film cathodes were fabricated by spray pyrolysis and pulsed laser deposition (PLD). These films show nanometer sized grains and a thickness <1 μm. They are dense after deposition and develop porosity upon annealing at 600–900 °C. Sprayed films develop roughly twice the porosity of films deposited by PLD. Solid-state dewetting similar to metallic films is proposed as the mechanism for the pore formation. The amount of porosity can be tailored by the deposition process, the annealing conditions and the chemistry of the precursor. The connection between porosity and electrical conductivity was also investigated.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2007.05.004