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High-resolution transmission electron microscopy observations of La2Zr2O7 thin layers on LaAlO3 obtained by chemical methods

Published online by Cambridge University Press:  31 January 2011

L. Rapenne ,
C. Jiménez ,
T. Caroff ,
C. Million ,
S. Morlens ,
P. Bayle-Guillemaud  and
F. Weiss
L. Rapenne
Affiliation:
LMGP—UMR 5628 Centre national de la Recherche Scientifique (CNRS)—Grenoble INP, Grenoble 38016, France
C. Jiménez*
Affiliation:
LMGP—UMR 5628 Centre national de la Recherche Scientifique (CNRS)—Grenoble INP, Grenoble 38016, France
T. Caroff
Affiliation:
LMGP—UMR 5628 Centre national de la Recherche Scientifique (CNRS)—Grenoble INP, Grenoble 38016, France
C. Million
Affiliation:
LMGP—UMR 5628 CNRS—Grenoble INP, Grenoble 38016, France; and CRETA—Centre national de la Recherche Scientifique (CNRS) UPS2070, Grenoble 38042, France
S. Morlens
Affiliation:
CRETA—Centre national de la Recherche Scientifique (CNRS) UPS2070, Grenoble 38042, France
P. Bayle-Guillemaud
Affiliation:
CEA-Grenoble, INAC/SP2M/LEMMA, Grenoble 38054 cedex 9, France
F. Weiss
Affiliation:
LMGP—UMR 5628 Centre national de la Recherche Scientifique (CNRS)—Grenoble INP, Grenoble 38016, France
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

La2Zr2O7 (LZO) films have been grown by metalorganic decomposition (MOD) to be used as buffer layers for coated conductors. LZO can crystallize into two similar structures: fluorite or pyrochlore. Coated conductor application focuses on pyrochlore structure because it is a good barrier against oxygen diffusion. Classical x-ray diffraction is not able to separate the contribution of these two structures. Transmission electron microscopy and high-resolution transmission electron microscopy were used to determine the local distribution of these two phases in epitaxial LZO layers grown on LaAlO3. A characteristic feature of LZO thin films deposited by MOD is the formation of nanovoids in an almost single-crystal structure of LZO pyrochlore phase. For comparison, LZO layers deposited by metalorganic chemical vapor deposition were also studied. In this last case, the film is compact without voids and the structure corresponds to pyrochlore phase. Thus, the formation of nanovoids is a characteristic feature of MOD grown films.

Keywords

Metalorganic depositionSuperconductingTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 4 , April 2009 , pp. 1480 - 1491
Copyright
Copyright © Materials Research Society 2009

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