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

Publication Type

Journal Article

Authors

Li, H., L. Salamanca-Riba, Ramamoorthy Ramesh, J.H. Scott

DOI

10.1557/JMR.2003.0233

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.

Journal

Journal of Materials Research

Volume

Year of Publication

2003

ISSN

08842914

Notes

cited By 16

Research Areas

Ramesh Lab