Effect of heat-treatment parameter of YBCO film by TFA-MOD process

We fabricated YBCO coated conductors (CCs) by TFA-MOD process and evaluated microstructure, texture formation, and critical temperature (Tc) and current (Ic). YBCO precursor solution was synthesized using metal-trifluoroacetates and dip coated on LaAlO3(LAO) substrate. The phase formation and microstructure was characterized by X-ray diffraction and scanning electron microscopy (SEM) and the degree of texture was evaluated by pole-figure analysis. The CC was heat-treated in various calcining temperatures (370 degrees C - 460 degrees C) and firing temperatures (750 degrees C - 800 degrees C) . As fired at 775 degrees C for 4h, the CC had the highest Tc of 89.5 K and Ic of 40 A/cm-width (Jc=2.0 MA/cm2). Microstructural observation indicated that the YBCO film was dense and homogeneous and had a strong cube texture without formation of second phase and its in-plane full-width at half-maxima; 5.2under optimum condition.