On the crystal-orientation of YBa₂Cu₃O_x (1)

Abstract

An attempt to prepare the iron-doped Y-Ba-Cu polycrystalline oxides, in which the preferred planes of conductivity are oriented in a magnetic field, has been curried out. For the sintered samples with the composition of (1-y)[YBa₂Cu₃O_x]⋅Fe₂O₃ (y=0.15-0.7), the marked lowering of the conductivity was prior to the increase of the magnetization with increasing concentration of Fe atoms. When Y atoms in Y_1-yFe_yBa₂Cu₃O_x (y=0.1-0.3) was replaced by Fe atoms, the change of conductivity was slight and Tc dropped to a lower temperature. No noticeable difference in the conductivity measured between the direction perpendicular to the c-axis and the direction along to that in the crystal-oriented samples. The effect of the addition of Fe atoms on the temperature dependency of resistivity, the precipitation of other phases, the magnetude of magnetization and microstructure were also investigated.