Fabrication of YBCO coated conductor by TFA-MOD method in route of dissolving Y211 and Ba3Cu5O8 powders in TFA

We observed that for the films fired at 725 °C, BaF2 and other second phases formed and Tc was measured to be 66.5 K. In contrast, when the film was fired at 775 °C, strong and sharp (0 0 l) diffraction peaks of YBCO were observed, without the formation of the BaF2 phase. In addition, X-ray pole-figure analysis indicated that a strong biaxial texture was developed and the full-width at half-maximums of in-plane and out-of-plane textures were 4.38° and 4.26°, respectively. The critical temperature and current were also increased to 85.3 K and 35.8 A/cm-width, respectively, at 77 K when the oxygen heat treatment time was increased to 20 h. Microstructure observation indicated that a crack-free surface was obtained and that there was no a-axis grain growth.