| Abstract: | An experimental study has been carried out to investigate the synergistic effect of Ba4CuPt2O9 compounds on the critical current density of fluorine-doped YBCO superconductors. The Ba4CuPt2O9 compounds were synthesized by a solid state reaction. It was found that the synthesis temperature of the Ba4CuPt2O9 compounds was over 800°C, which was higher than that ever reported previously. In addition, the influence of Ba4CuPt2O9 compounds on the critical current density of YBCO superconductors has been investigated using two types of Ba4CuPt2O9 compounds: one is not heat-treated, i.e. source materials; and the other is heat-treated at 950°C. It was found that the former affected the orientation of the c-axes, but the latter did not have an influence on the orientation of the c-axes, but adversely affected the superconductivity of samples quenched at temperatures above 850°C. |
