Growth of epitaxial Y2O3 buffer layers on biaxially textured Ni-W substrates for YBCO coated conductors by MOD approach

M. S. Bhuiyan, M. Paranthaman, S. Kang, D. F. Lee, K. Salama

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

We have grown epitaxial Y2O3 buffer layers on biaxially textured Ni-W substrates for YBCO coated conductors using a newly developed metal organic decomposition (MOD) approach. Y2O 3 precursor solution of 0.25 M concentration was spin coated on short samples of Ni-3 at.%W (Ni-W) substrates and heat-treated at 1150 °C in a gas mixture of Ar-4% H2 for an hour. Detailed X-ray studies indicate that Y2O3 films have good out-of-plane and in-plane textures with full-width-half-maximum values of 6.22° and 7.51°, respectively. SEM and AFM investigations of Y2O 3 films reveal a fairly dense and smooth microstructure without cracks and porosity. Highly textured YSZ barrier layers and CeO2 cap layers were deposited on MOD Y2O3-buffered Ni-W substrates using rf-magnetron sputtering. Pulsed laser deposition was used to grow YBCO films on these substrates. A critical current, Jc, of about 1.21 MA/cm2 at 77 K and self-field was obtained on YBCO (PLD)/CeO2 (sputtered)/YSZ (sputtered)/Y2O3 (spin-coated)/Ni-W.

Original languageEnglish
Pages (from-to)95-101
Number of pages7
JournalPhysica C: Superconductivity and its Applications
Volume422
Issue number3-4
DOIs
StatePublished - Jun 1 2005

Funding

Thanks are due to A. Goyal and L. Heatherly for providing the Ni–W substrates and S. Sathyamurthy for valuable insight. This work was supported by the US Department of Energy, Division of Materials Sciences, Office of Science, Office of Electric Transmission and Distribution. This research was performed at the Oak Ridge National Laboratory, managed by U.T.-Battelle, LLC for the USDOE under contract DE-AC05-00OR22725. M.S. Bhuiyan would also like to acknowledge the help of AFOSR for providing a financial support.

Keywords

  • Buffer layer
  • Epitaxial
  • Metal organic decomposition
  • Superconductor

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