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Development of Electrodeposited Iridium as a Buffer Layer for YBCO Superconductors

Published online by Cambridge University Press:  01 February 2011

Priscila Spagnol ,
Tapas Chaudhuri ,
Raghu Bhattacharya  and
Sovannary Phok
Priscila Spagnol
Affiliation:
National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA
Tapas Chaudhuri
Affiliation:
National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA
Raghu Bhattacharya
Affiliation:
National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA
Sovannary Phok
Affiliation:
National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA
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Abstract

Electrodeposition (ED) is a potentially low-cost, non-vacuum, high-rate deposition process that can easily deposit uniform film on large non-planar substrates. In this paper, we report on successful biaxial textured electrodeposition of Ir on Ni-W substrates. Ir metal is well known for its excellent oxidation and corrosion resistance among platinumgroup elements; also, the lattice mismatch of cubic Ir is very close to that of CeO2 and Ni. The films were deposited in a vertical cell in which the electrodes (both working and counter) were suspended vertically from the top of the cell. The ED experiments were performed at 65°C without stirring the solution. The ED precursors were prepared at about -1.2 V from 2 to 15 minutes on Ni-W, where the Pt counter and Pt pseudo-reference electrodes were shorted together. To qualify the electrodeposited Ir buffer layer, a CeO2/YSZ/CeO2 and YSZ/CeO2 buffer structure was later deposited on ED Ir-coated Ni-W substrates by pulsed-laser deposition. The ED Ir/metal substrates were first heated at 800°C in 0.5 mTorr of forming gas, and then a CeO2 seed layer was deposited in 180 mTorr of forming gas. Subsequently, YSZ and CeO2 layers were deposited sequentially in 0.1 mTorr of oxygen.

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 , C5.5
Copyright
Copyright © Materials Research Society 2005

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References

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