Strontium oxide segregation at SrLaAlO4 surfaces

A. E. Becerra-Toledo; L. D. Marks

doi:10.1016/j.susc.2010.05.011

Strontium oxide segregation at SrLaAlO₄ surfaces

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

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

14 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 language	English (US)
Pages (from-to)	1476-1480
Number of pages	5
Journal	Surface Science
Volume	604
Issue number	17-18
DOIs	https://doi.org/10.1016/j.susc.2010.05.011
State	Published - 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

Access to Document

10.1016/j.susc.2010.05.011

Cite this

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title = "Strontium oxide segregation at SrLaAlO4 surfaces",

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.",

keywords = "Diffusion and migration, Electron microscopy, Single crystal surfaces, SrLaAlO4, Surface segregation",

author = "Becerra-Toledo, {A. E.} and Marks, {L. D.}",

note = "Funding Information: This work was supported by the US Department of Energy under grant number DOE DE-FG02-01ER45945 . All TEM and SEM work was performed in the EPIC facility, part of the NUANCE Center at Northwestern University. The NUANCE Center is supported by NSF-NSEC , NSF-MRSEC , the Keck Foundation , the State of Illinois , and Northwestern University . A.E. Becerra-Toledo would also like to acknowledge Dr. Yingmin Wang's valuable instruction.",

year = "2010",

month = aug,

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doi = "10.1016/j.susc.2010.05.011",

language = "English (US)",

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journal = "Surface Science",

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number = "17-18",

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T1 - Strontium oxide segregation at SrLaAlO4 surfaces

AU - Becerra-Toledo, A. E.

AU - Marks, L. D.

N1 - Funding Information: This work was supported by the US Department of Energy under grant number DOE DE-FG02-01ER45945 . All TEM and SEM work was performed in the EPIC facility, part of the NUANCE Center at Northwestern University. The NUANCE Center is supported by NSF-NSEC , NSF-MRSEC , the Keck Foundation , the State of Illinois , and Northwestern University . A.E. Becerra-Toledo would also like to acknowledge Dr. Yingmin Wang's valuable instruction.

PY - 2010/8/30

Y1 - 2010/8/30

N2 - 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.

AB - 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.

KW - Diffusion and migration

KW - Electron microscopy

KW - Single crystal surfaces

KW - SrLaAlO4

KW - Surface segregation

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DO - 10.1016/j.susc.2010.05.011

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JO - Surface Science

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