We have investigated the influence of the starting solution composition on both the microstructure and superconducting properties of YBa2Cu3O7-x (YBCO) films deposited on CeO2 buffered IBAD-Gd2Zr2O7/Hastelloy substrates and (1 0 0)-oriented LaAlO3 single crystals by the advanced TFA-MOD process. The starting solutions with different compositions of molar ratios of Y:Ba:Cu = 1.0:1.0-3.0:3.0 were studied. The critical current density (Jc) values of the YBCO films fabricated from Ba-rich (molar ratio of Ba/Y > 2) starting solutions were low. On the other hand, high Jc values were recognized, when the YBCO films were prepared from the Ba-poor (molar ratio of Ba/Y < 2) starting solutions. The highest Jc value of 3.5 MA/cm2 (77 K, self-field) was obtained at a Ba/Y molar ratio of 1.4-1.6. Finally, the extremely high critical current (Ic) value of 735 A/cm-width (77 K, self-field) was obtained, when the YBCO film was fabricated on CeO2 buffered IBAD-Gd2Zr2O7/Hastelloy substrates by using the Ba-poor (Ba/Y = 1.5) starting solution.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering