Remarkably High Tc and Jc in the (T1,Pb,Bi)(Sr,Ba)2Ca2Cu3O9 System and Its Application in Superconducting Tapes

R. S. Liu ； S. F. Wu ； D. S. Shy ； C. H. Tai ； S. F. Hu ； D. A. Jefferson

《Chinese Journal of Physics》 31卷6S期 (1993/12) Pp. 951-959

並列摘要

We have found an efficient and highly reproducible method for the preparation of the homogeneous Tl-1223 powders by the partial substitution of Ba^2+ into the Sr^2+ sites in the (Tl0.6Pb0.2Bi0.2)(Sr2-xBax)Ca2Cu3O9 (Tl-1223) system. A high intrinsic critical current density (Jc) and a high superconducting transition temperature (Tc) were observed in this material. The chemical composition and crystal structure of Tl- 1223 were determined by X-ray diffraction (XRD) and energy dispersive spectrometry (EDS). Superconducting tapes (sheathed in silver) based on the titled system have been fabricated using the powder-in-tube method. Typical critical temperatures (Tc) of around 120 K and transport critical current densities (Jc) of about 1.05 x 10^4 A/cm^2 at 77 K in a zero magnetic field have been routinely obtained on short lengths. (~ 3 cm) of the sintered Tl-1223 tapes after rolling. The Jc at 77 K in a zero magnetic field can be improved to 1.33 x 10^4 A/cm^2 on short lengths of the sintered tapes after rolling and pressing. Moreover, the results on the (Tl,Pb,Bi)(Sr,Ba)2Ca2Cu3O9 long lengths of tapes (~ 12 m), pancake coils and prototype superconducting magnet will also be given.