Speaker
Description
Since the discovery the first YBaCuO superconductor has been found in 1987, called as Y123 (YBa$_2$Cu$_3$O$_7$$_-$$_x$) superconductor. The effect of Ag$_2$O on the critical temperature was investigate. However, the new YBaCuO called Y156 superconductor was found, then we interest in effect of Ag$_2$O on some physical properties of this superconductor. The Y156 superconductor doped Ag$_2$O (YBa$_5$Cu$_6$O$_1$$_3$$_-$$_y$+xAg$_2$O where x = 0, 0.05, 0.10, 0.15, 0.20) were synthesized by solid state reaction, with calcination temperature, and sintering temperature at 900 $^0$C, annealing temperature at 550 $^0$C. All of samples obtained were investigated by SEM, EDX, resistivity measurement, and the standard iodometric titration. The highest critical temperature was found in pure Y156 at 95 K. The lowest critical temperature was found in Y156 doped 0.05Ag$_2$O at 89K. We found that the surface of Y156 was improved by Ag$_2$O adding on the porous structure. The pore size in Y156 doped Ag$_2$O was smallest at 4.6 µm for Y156 doped 0.20Ag$_2$O.The effect of the ratio of Cu$^3$$^+$/Cu$^2$$^+$ depend on the critical temperature of Y156 doped Ag$_2$O was found.
