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Microstructure and Reconstruction of LaAlO3 {100} and {110} Surfaces

Published online by Cambridge University Press:  21 February 2011

Z. L. Wang
Affiliation:
Metallurgy Division, National Institute of Standards and Technology, Gaithersburg, MD 20899.
A. J. Shapiro
Affiliation:
Metallurgy Division, National Institute of Standards and Technology, Gaithersburg, MD 20899.
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Abstract

Lathanum-aluminate (LaAlO3) is one of the optimum substrates for epitaxic growth of thin oxide films. In this paper, the structures of the {100} and {110} surfaces of annealed LaAlO3 are studied using reflection electron microscopy (REM). [010] and [001] steps have been observed on {100}, these are believed to be the lowest surface energy steps. The {100} surface is atomically flat, but the {110} surfaces exhibit high-density fine structures distributed on large surface terraces. These fine structures may correspond to the formation of small width (100) and (010) facets on the (110) surface. The 5×5 reconstruction is observed on {100}. No reconstruction is found on {110}.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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References

1. Wang, Z.L., Christen, D.K., Klabunde, C.E., Kroeger, D.M., Lowndes, D.H. and Norton, D.P., in Proc. of 52nd Annu, Meet, of Microscopy Soc. of America (San Francisco Press, 1994), Bailey, G.W. and Garratt-Reed, A.J. eds., pp. 790.Google Scholar
2. Lowndes, D.H., Wang, Z.L., Christen, D.K., Klabunde, C.E., Kroeger, D.M., and Norton, D.P., in preparation.Google Scholar
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8. Thanks to Drsvan Heerden, D. and Weissmuller, J. for detailed comments and discussion.Google Scholar

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