Phase constitution, Sr distribution and morphology of self-assembled La-Sr-Co-O 
composite films prepared by PLD

Stämmler, S.; Merkle, R.; Stuhlhofer, B.; Logvenov, G.; Hahn, K.; van Aken, P. A.; Maier, J.

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Phase constitution, Sr distribution and morphology of self-assembled La-Sr-Co-O composite films prepared by PLD

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Merkle, R.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Stuhlhofer, B.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

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Logvenov, G.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

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Hahn, K.
Scientific Facility Stuttgart Center for Electron Microscopy (Peter A. van Aken), Max Planck Institute for Solid State Research, Max Planck Society;

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van Aken, P. A.
Scientific Facility Stuttgart Center for Electron Microscopy (Peter A. van Aken), Max Planck Institute for Solid State Research, Max Planck Society;

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Maier, J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Stämmler, S., Merkle, R., Stuhlhofer, B., Logvenov, G., Hahn, K., van Aken, P. A., et al. (2017). Phase constitution, Sr distribution and morphology of self-assembled La-Sr-Co-O composite films prepared by PLD. Solid State Ionics, 303, 172-180.

Cite as: https://hdl.handle.net/21.11116/0000-000E-D092-1

Abstract

Thin compact La-Sr-Co-O composite films consisting of both (La,Sr)CoO3-delta and (La,Sr)(2)CoO4+delta crystallites and a total La:Sr ratio of 70:30 were prepared by phase separation on a single crystal Y-stabilized zirconia substrate using pulsed laser deposition (PLD) from a single target. The self-assembled composite films have grains of about 50 nm lateral extension with a (La,Sr)CoO3-delta/(La,Sr)(2)CoO4+delta/O-2 triple phase boundary density of 1.1-2.6.10(5) cm/cm(2). Sr is accumulated in (La,Sr)(2)CoO4+delta at the expense of (La,Sr)CoO3-delta, but less than expected for thermodynamic equilibrium. Insufficient cation diffusivity for complete demixing can cause the formation of metastable La-Sr-Co-O phases: (1) a Co-deficient perovskite phase La0.7Sr0.3Co0.9O3-delta with high oxygen reduction activity, (2) a higher-order Ruddlesden-Popper phase. These results lay the basis for an accurate quantification and understanding of the potentially high oxygen reduction reaction activities of such films. (C) 2017 Elsevier B.V. All rights reserved.