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Growth Mechanism and Opmization of MOD CeO2 Buffer Layers for TFA YBa2Cu3O7/CeO2 Multilayers

Published online by Cambridge University Press:  01 February 2011

Felip Sandiumenge ,
Andrea Cavallaro ,
Mariona Coll ,
Jaume Gàzquez ,
Teresa Puig ,
Alberto Pomar ,
Neus Romá ,
Narcís Mestres  and
Xavier Obradors
Felip Sandiumenge
Affiliation:
Institut de Ciència de Materials, C.S.I.C., Campus de la UAB, 08193 Bellaterra, Catalonia, Spain.
Andrea Cavallaro
Affiliation:
Institut de Ciència de Materials, C.S.I.C., Campus de la UAB, 08193 Bellaterra, Catalonia, Spain.
Mariona Coll
Affiliation:
Institut de Ciència de Materials, C.S.I.C., Campus de la UAB, 08193 Bellaterra, Catalonia, Spain.
Jaume Gàzquez
Affiliation:
Institut de Ciència de Materials, C.S.I.C., Campus de la UAB, 08193 Bellaterra, Catalonia, Spain.
Teresa Puig
Affiliation:
Institut de Ciència de Materials, C.S.I.C., Campus de la UAB, 08193 Bellaterra, Catalonia, Spain.
Alberto Pomar
Affiliation:
Institut de Ciència de Materials, C.S.I.C., Campus de la UAB, 08193 Bellaterra, Catalonia, Spain.
Neus Romá
Affiliation:
Institut de Ciència de Materials, C.S.I.C., Campus de la UAB, 08193 Bellaterra, Catalonia, Spain.
Narcís Mestres
Affiliation:
Institut de Ciència de Materials, C.S.I.C., Campus de la UAB, 08193 Bellaterra, Catalonia, Spain.
Xavier Obradors
Affiliation:
Institut de Ciència de Materials, C.S.I.C., Campus de la UAB, 08193 Bellaterra, Catalonia, Spain.
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Abstract

The evolution from a partially oriented granular microstructure to a dense epitaxial one in CeO2 buffer layers deposited by metallorganic decomposition (MOD) on single crystal Y-stabilised ZrO2 (YSZ) substrates, has been investigated. CeO2 buffer layers were investigated using X-ray diffraction (XRD), atomic force microscopy (AFM), reflection high energy electron diffraction (RHEED), transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS). Reducing atmospheric conditions inhibit grain growth resulting in a nanometric granular microstructure with a high concentration of C impurities decorating grain boundaries and porosity. Oxidation and elimination of C species promotes grain growth resulting in a dense epitaxial film, as well as stabilizes otherwise energetically prohibitive polar (001) planes. Trifluoracetate (TFA) derived MOD YBa2Cu3O7 (YBCO) films deposited on optimized CeO2 buffers exhibit a sharp interface while the undesired reaction giving BaCeO3 is minimized. Jc values of 1.5 MA/cm2 and 14 MA/cm2 at 77K and 5K, respectively, are achieved.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 868: Symposium C – Recent Advances in Superconductivity - Materials Synthesis, Multiscale Characterization and Functionally Layered Composite Conductors , 2005 , C6.8
Copyright
Copyright © Materials Research Society 2005

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