%0 Journal Article
%K deposition
%K thin films
%K transmission electron microscopy
%K ions
%K oxides
%K substrates
%K oxide films
%K lanthanum compounds
%K Computer simulation
%K X ray diffraction
%K Crystal lattices
%K Molecular structure
%K Crystal atomic structure
%K Spectrometers
%K Cubic face centered cubic structure
%K Energy dispersive spectrometry
%K High resolution lattice images
%K Perovskite structure
%A H Li
%A L Salamanca-Riba
%A Ramamoorthy Ramesh
%A J.H Scott
%B Journal of Materials Research
%D 2003
%G eng
%I Materials Research Society
%P 1698-1704
%R 10.1557/JMR.2003.0233
%T Ordering in (La,Sr)(Al,Ta)O3 substrates
%V 18
%X (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.