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영어

The effect of the addition of the nano size Y2O3 powder on the microstructurte and superconducting properties of YBCO thin film deposited on LAO single crystalline substrate by TFA-MOD method was studied. Nano size Y2O3 powder was added to the stoichiometric precursor solution with a cation ratio of Y : Ba : Cu = 1 : 2 : 3 prepared using TFA as chelating agent. Precursor solutions with and without Y2O3 addition were coated on LaAlO3(100) single crystalline substrates by dip coating method. Calcination and conversion heat treatments were performed in controlled atmosphere containing moisture Current carrying capacity(Jc) of YBCO film was enhanced about 50 % by Y2O3 doping and it is thought to be due to the better connectivity of YBCO grains and/or the flux pinning by the Y2O3 particles embedded in YBCO grains.