YBCO THICK FILMS BY SOFT CHEMICAL MELT-ANNEALING METHOD

Thick films (≥ 1 μm) of YBa2Cu3O7-δ were deposited by the dip-coating method on MgO (100) substrates at room temperature. After that, superconducting films were obtained by using the melt-annealing method with different thermal treatments. These films showed both different crystalline orientations and critical current densities (Jc). Additionally the thick films displayed superconducting transitions (Tc) around 89.5 K and critical current densities ≥ 2x10(4) A/cm² at 77 K and 0t. The highest Tc and Jc values achieved were attributed mainly to the higher oxygen content and the growth of larger grain sizes as determined by XRD and SEM analysis respectively.