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  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., 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.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000E-D092-1 Version Permalink: https://hdl.handle.net/21.11116/0000-000E-D093-0
Genre: Journal Article

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Stämmler, S., Author
Merkle, R.1, Author           
Stuhlhofer, B.2, Author           
Logvenov, G.2, Author           
Hahn, K.3, Author           
van Aken, P. A.3, Author           
Maier, J.1, Author           
Affiliations:
1Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370483              
2Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370497              
3Scientific Facility Stuttgart Center for Electron Microscopy (Peter A. van Aken), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370493              

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 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.

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Language(s): eng - English
 Dates: 2017
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 734926
ISI: 000405880600024
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Title: Solid State Ionics
Source Genre: Journal
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Publ. Info: AMSTERDAM : ELSEVIER SCIENCE BV
Pages: - Volume / Issue: 303 Sequence Number: - Start / End Page: 172 - 180 Identifier: ISSN: 0167-2738