Fabrication and Properties of (Y,Gd) BCO Superconductors
来源期刊：JOURNAL OF RARE EARTHS2004年第6期
论文作者：焦玉磊 肖玲 郑明辉 任洪涛
Key words：(Y,Gd)BCO; superconductor; melt processing; peritectic decomposition temperature; rare earths;
Abstract: 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.
焦玉磊1，肖玲1，郑明辉1，任洪涛1
(1.Superconducting Materials Researeh Center,General Research Institute for Non-Ferrous Metals,Beijing 100088,China)
Abstract: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.
Key words:(Y,Gd)BCO; superconductor; melt processing; peritectic decomposition temperature; rare earths;
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