Optimization of oxygenation process in YBCO tapes fabricated by TFA-MOD method

The effect of oxygen doping on the superconducting properties, such as Tc, Jc and the irreversibility line, of YBCO coated conductor prepared by the TFA-MOD method was investigated. We observed a systematic change of Tc value as oxygen annealing temperature, Ta indicating the oxygen doping level was successfully modified by the heat treatment. The oxygen doping caused an upward shift of the irreversibility line as well as an increase of Jc at wide temperature and field range. We also performed a high-temperature X-ray diffraction measurement to observe the oxygen absorption behavior. The result suggests the mobility of oxygen becomes very slow at the temperature below 350 °C.