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X-ray Photoelectron Spectroscopy Study on E-beam Co-evaporated YBCO Precursors and their Post –deposition Conversion

Published online by Cambridge University Press:  01 February 2011

Yifei Zhang ,
Ron Feenstra  and
David K. Christen
Yifei Zhang
Affiliation:
The Department of Materials Science & Engineering, The University of Tennessee, Knoxville, TN 37996-2200, U.S.A.
Ron Feenstra
Affiliation:
Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6061, U.S.A.
David K. Christen
Affiliation:
Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6061, U.S.A.
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Abstract

Electron beam co-evaporation is one of the ex situ techniques being developed for cost-effective fabrication of YBa2Cu3O7-δ (YBCO) coated conductors. To achieve high critical current (Ic) and fast conversion, further understanding is needed of the chemical and microstructural characteristics of the precursors and the phase evolution process towards the epitaxial c-axis oriented YBCO film during the post-deposition conversion annealing. In this study, X-ray photoelectron spectroscopy (XPS) was used to investigate the chemical and compositional profiles of the precursors. Samples quenched from the processing stage were also inspected for identifying the transient elemental chemical states during the YBCO phase formation. XPS survey and detailed spectra were recorded for the surfaces and through various depths. It is suggested that XPS spectra, especially the “Auger parameters” can be used for revealing the conversion reaction. Preliminary results indicate that the copper oxidation state might have important effect on precursor conversion behaviors.

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 , C7.9
Copyright
Copyright © Materials Research Society 2005

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