A Study of High Tc Supercpnducter Y_(1-X) Ba_2 Cu_3 O_y
Xu Jianfeng, Fu Ruisheng, Li Yuncai (Department of Physics, Henan University)
In this study,by partly replacing Y2O3 With Tb4O7,a series of samples were synthesized. The R - T curves and X-ray diffraction patterns of the samples were measured. From experiments,it was found that Tb does not enter the Y - site. The absence of YBa2Ou3Oy type structure containing Tb ions in these cases is explained asthe high stability of phases Tb4+Ba2+O3 which dominate the phase diagram.