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Influence of the substrate microstructure on the superconducting properties of YBCO coated conductors

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10 Author(s)
G. Celentano ; ENEA Res. Center, Frascati, Italy ; E. Varesi ; T. Petrisor ; V. Boffa
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The microstructure of Ni-5at%W (Ni-W) and Ni-11at%V (Ni-V) biaxially textured substrates has been investigated using X-ray diffraction (XRD) and electron backscatter diffraction (EBSD). The correlation between the substrate microstructure and superconducting transport properties of YBa2Cu3O7-y (YBCO) film grown on it has been studied on the YBCO/CeO2/Ni-W and YBCO/CeO2/NiO/Ni-V architectures. Our study has ascertained that the in-plane texture of the substrates is one of the most important factors, limiting the critical current density. The Ni-V substrate has a lower percolation area due to the larger number of twinned grains and a broader in-plane angular distribution and, as a consequence, the YBa2Cu3O7-y (YBCO) film grown on it has a critical current density of 0.6 × 106 A/cm2, depressed by factor 2 with respect to YBCO grown on the Ni-W substrate. For the Ni-V substrate, another limiting factor is its low oxidation resistance. In contrast to Ni-V, the Ni-W substrate has a larger percolation area, mainly due to the absence of twinned grains, and a high oxidation resistance.

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IEEE Transactions on Applied Superconductivity  (Volume:13 ,  Issue: 2 )