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Ni/YBa2Cu3O7−x and Ni/Bi2Sr2Ca0.8Y0.2Cu2Ox interface formation: Reactivity, segregation, and chemical trapping

Published online by Cambridge University Press:  31 January 2011

H.M. Meyer III ,
D.M. Hill ,
J.H. Weaver ,
K.C. Goretta  and
U. Balachandran
H.M. Meyer III
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
D.M. Hill
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
J.H. Weaver
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
K.C. Goretta
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
U. Balachandran
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
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Abstract

Interfaces formed by condensing Ni atoms onto YBa2Cu3O7−x (Y-123) and Bi2Sr2Ca0.8Y0.2Cu2Ox (Bi-2212) have been studied with x-ray photoelectron spectroscopy. For both Y-123 and Bi-2212, the Ni 2p3/2 and O 1s core level features indicate Ni–O reactions and changes in the Cu 2p3/2 emission that reflect reduction from nominal Cu2+ to Cu1+ oxidation states. Ni deposition onto Bi-2212 also reduces Bi–O bonding and releases Bi atoms. For Ni/Y-123, analysis of emission intensities as a function of coverage shows that O and Ba intermix in the growing metal overlayer but that Cu is trapped at the buried interface. For Ni/Bi-2212, similar analysis shows O and Bi intermixing but less effective Cu trapping.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 2 , February 1991 , pp. 270 - 277
Copyright
Copyright © Materials Research Society 1991

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