Fabrication and Properties of （Y, Gd）BCO Superconductors
摘要
The microstructures and superconducting properties of melt textured(Y1-xGdx)BCO bulk samples were studied. It was found that the peritectic decomposition temperature(Tm)of(Y1-xGdx)BCO samples increases with increasing x. Large single domain growth in air is readily obtained in all the composites. The results of X-ray distribution maps of x=0.4 composite indicate that the RE123 matrix is homogeneous and Y and Gd elements in the RE site forms a perfect solid solution. The onset Tc values exceeding 91 K with relatively broad transitions are obtained for almost all the samples. Magnetization measurements show no marked indication for the formation of a peak effect in the Jc-B curves, and the highest Jc measured is 3.08×104 A·cm-2 for x=0.4 sample at 77 K and self-field. The results clearly indicate that Y dominates the superconducting properties of x=0.2 and 0.4 composites.