Strontium oxide segregation at SrLaAlO4 surfaces

A. E. Becerra-Toledo*, L. D. Marks

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)1476-1480
Number of pages5
JournalSurface Science
Volume604
Issue number17-18
DOIs
StatePublished - Aug 30 2010

Keywords

  • Diffusion and migration
  • Electron microscopy
  • Single crystal surfaces
  • SrLaAlO4
  • Surface segregation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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