Strontium oxide segregation at SrLaAlO sub(4) surfaces

We report observable segregation of strontium oxide at the surface of strontium lanthanum aluminate single-crystals annealed in oxidizing conditions. Electron microscopy imaging and energy-dispersive X-ray spectroscopy showed that Sr and O segregation occurs on strontium lanthanum aluminate surfaces...

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Bibliographic Details
Published in:Surface science 2010-08, Vol.604 (17-18), p.1476-1480
Main Authors: Becerra-Toledo, A E, Marks, L D
Format: Article
Language:English
Subjects:
Aluminates
Islands
Lanthanum
Perovskite structure
Segregations
Stacking faults
Strontium
Strontium oxides
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Summary:We report observable segregation of strontium oxide at the surface of strontium lanthanum aluminate single-crystals annealed in oxidizing conditions. Electron microscopy imaging and energy-dispersive X-ray spectroscopy showed that Sr and O segregation occurs on strontium lanthanum aluminate surfaces in the form of polycrystalline islands. The appearance of islands on the (100) and other high-free energy surfaces is strongly suggestive of rocksalt SrO formation. The loss of strontium oxide from the bulk is not compensated solely by point defects, but rather by non-stoichiometric stacking faults which locally result in stable perovskite structures.
ISSN:0039-6028
DOI:10.1016/j.susc.2010.05.011