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Structural complexity in AA′MM′O6 Perovskites. A Transmission Electron Microscopy Study

Published online by Cambridge University Press:  01 February 2011

Susana García-Martín ,
Esteban Urones-Garrote ,
Meghan C. Knapp ,
Graham King  and
Patrick M. Woodward
Susana García-Martín
Affiliation:
[email protected], Complutense University, Inorganic Chemistry, Madrid, Spain
Esteban Urones-Garrote
Affiliation:
[email protected], Complutense University, Inorganic Chemistry, Madrid, Spain
Meghan C. Knapp
Affiliation:
[email protected], The Ohio State University, Department of Chemistry, Columbus, Ohio, United States
Graham King
Affiliation:
[email protected], The Ohio State University, department of Chemistry, Columbus, Ohio, United States
Patrick M. Woodward
Affiliation:
[email protected], The Ohio State University, Department of Chemistry, Columbus, Ohio, United States
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Abstract

We have prepared five perovskite compounds which have two different A-site cations and examined the ordering of the A-site lattice through powder X-ray diffraction, TEM, HRTEM, HAADF-STEM, STEM-EELS. NaLaTi2O6 and NaLaZr2O6 show no indication of cation ordering by XRD but TEM analysis reveals that the A-site cations are ordered into layers in nanometer domains which have perpendicular orientations of the layers. NaLaMgTeO6 has larger domains which can be detected by XRD. XRD has revealed that both NaLaMgWO6 and KLaMnWO6 have nearly complete long range layered ordering of the A-site cations. TEM microscopy has further shown that a compositional modulation exists in both compounds. NaLaMgWO6 organizes into alternating stripes ˜24Å wide that are compositionally distinct from each other. KLaMnWO6 shows similar behaviour except with a chessboard pattern.

Keywords

microstructuretransmission electron microscopy (TEM)scanning transmission electron microscopy (STEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1148: Symposium PP – Solid-State Chemistry of Inorganic Materials VII , 2008 , 1148-PP15-05
Copyright
Copyright © Materials Research Society 2009

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References

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