Synthesis, characterization and electrical properties of La₀.₇Sr₀.₃Co₀.₂Fe₀.₈O₃/Gd–CeO₂ thin films (≤500 nm)
2014
Muller, Guillaume | Ringuede, Armelle | Laberty-Robert, Christel
A simple route toward the synthesis of mesostructured composite La₀.₇Sr₀.₃Co₀.₂Fe₀.₈O₃x/yGd–CeO₂ (LSCFx/yGDC) (with x and y representing the volumetric% of LSCF and GDC in the composite films) thin films exhibiting both high electrical conductivities and optimized bicontinuous pore-solid network is reported. Because of the size of the pore wall, the mesostructured composite film is crystalline with particle size in the nanometer range even after a heat-treatment at 700 °C in air. Crystallization of the film was studied by in situ impedance spectroscopy. This technique allows us to define the heat-treatment, the LSCF content in the composite film and the thickness of the film to achieve good electrical conductivity. The highest electrical conductivity of 250 S cm⁻¹ was found for the pure, mesoporous LSCF film at 700 °C.
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