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Ordering in (La,Sr)(Al,Ta)O3 substrates

Published online by Cambridge University Press:  31 January 2011

H. Li ,
L. Salamanca-Riba ,
R. Ramesh  and
J. H. Scott
H. Li
Affiliation:
Department of Materials and Nuclear Engineering, University of Maryland, College Park, Maryland 20742
L. Salamanca-Riba
Affiliation:
Department of Materials and Nuclear Engineering, University of Maryland, College Park, Maryland 20742
R. Ramesh
Affiliation:
Department of Materials and Nuclear Engineering, University of Maryland, College Park, Maryland 20742
J. H. Scott
Affiliation:
National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899
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Abstract

(La, Sr)(Al, Ta)O3 (LSAT) has recently received increased attention as a substrate for the deposition of various oxide films. LSAT is usually considered as having a perovskite structure. However, the exact atomic structure of LSAT is not yet well known and has received little attention up to now. In this paper, a series of studies using x-ray diffraction, transmission electron microscopy, and energy dispersive spectrometry were conducted to determine the atomic structure of LSAT. It was found that LSAT consists of two types of domains: one with a simple cubic perovskite structure (disordered with a = 0.3868 nm) and the other with a face-centered-cubic structure (ordered with a = 0.773 nm). Computer image simulation of high-resolution lattice images suggests that the ordered structure is due to ordering of the Al and Ta ions.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 7 , July 2003 , pp. 1698 - 1704
Copyright
Copyright © Materials Research Society 2003

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References

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