Strontium oxide segregation at SrLaAlO4 surfaces |
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Authors: | AE Becerra-Toledo LD Marks |
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Institution: | Northwestern University, Department of Materials Science and Engineering, Evanston, IL 60208, USA |
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Abstract: | 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. |
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