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Assessment of chemical solution synthesis and properties of Gd2Zr2O7 thin films as buffer layers for second-generation high-temperature superconductor wires

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Abstract

Chemical solution processing of Gd2Zr2O7 (GZO) thin films via sol-gel and metalorganic decomposition (MOD) precursor routes have been studied on textured Ni-based tape substrates. Even though films processed by both techniques showed similar property characteristics, the MOD-derived samples developed a high degree of texture alignment at significantly lower temperatures. Both precursor chemistries resulted in exceptionally dense, pore-free, and smooth microstructures, reflected in the cross-sectional and plan-view high-resolution scanning and transmission electron microscopy studies. On the MOD GZO buffered Ni–3at.% W (Ni–W) substrates with additional CeO2/YSZ sputtered over layers, a 0.8-μm-thick YBa2Cu3O7−δ (YBCO) film, grown by an ex situ metalorganic trifluoroacetate precursor method, yielded critical current, Ic (77 K, self-field), of 100 A/cm width. Furthermore, using pulsed-laser deposited YBCO films, a zero-field superconducting critical current density, Jc (77 K), of 1 × 106 A/cm2 was demonstrated on an all-solution, simplified CeO2(MOD)/GZO(MOD)/Ni–W architecture. The present study establishes GZO buffers as a candidate material for low-cost, all-solution coated conductor fabrication.

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Authors and Affiliations

  1. Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA

    T. Aytug, M. Paranthaman, K. J. Leonard, H. Y. Zhai, M. S. Bhuiyan, E. A. Payzant, A. Goyal, S. Sathyamurthy, D. B. Beach, P. M. Martin & D. K. Christen

  2. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee, 37996, USA

    T. Aytug

  3. American Superconductor Corp., Westborough, Massachusetts, 01581, USA

    X. Li, T. Kodenkandath, U. Schoop & M. W. Rupich

  4. Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson AFB, Ohio, 45433, USA

    H. E. Smith, T. Haugan & P. N. Barnes

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  1. T. Aytug
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  2. M. Paranthaman
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  3. K. J. Leonard
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Correspondence to T. Aytug.

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This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/publications/jmr/policy.html.

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Aytug, T., Paranthaman, M., Leonard, K.J. et al. Assessment of chemical solution synthesis and properties of Gd2Zr2O7 thin films as buffer layers for second-generation high-temperature superconductor wires. Journal of Materials Research 20, 2988–2996 (2005). https://doi.org/10.1557/JMR.2005.0365

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