YBCO superconducting tapes by melt-annealing method on metallic Ni%5W substrates

Abstract

Superconducting tapes of YBCO-123 were produced by melt-annealing method on metallic Ni%5W substrates. YBCO thick films of about 1μm thick were deposited on Ni%5W tapes previously CeO2 coated using different thermal treatments. A final architecture of the tapes like Ni%5W/CeO2/YBCO/Au–Pd was achieved.Critical temperatures (Tc) of the superconducting tapes around 89K and critical current densities (Jc) of 104A/cm2 at 77K and B=0T were determined by resistive methods. All the samples displayed a granular character and the crystalline structure of the superconducting YBCO-123 with and preferential orientation along the c-axis as determined by SEM and XRD analysis, respectively. Both grain sizes and c-axis orientation are dependent of the thermal treatments.