Superconducting Properties of Sintered Pb-Doped Bi Oxide Superconductor Prepared by an Intermediate Repressing Process
Recently, we have shown that highly oriented microstructure was achieved by introducing intermediate repressing on bulk sample by powder method. The sintering has been done with the procedure of sintering of the pellet, re-cold-pressing(i.e. uniaxial compaction at room temperature) during the interrupted sintering and then resintering. We have also shown that the intermediate repressing accelerate the atomic diffusion rate, consequently, the growth rate of the high-Tc phase. By this method it becomes very easy to get almost single high-Tc phase by short sintering duration. However, in the higher fields above 0.1 T Jc decreases rapidly though those in the lower field were much improved by introducing this method. We studied the effects of Ag addition to the Bi system for the high Tc phase growth rate and superconducting characteristics on the bulk samples prepared by the powder method combined with the intermediate pressing process. It was found that the Jc decreases with the appearance of Ag rich phase, in particular, excess amount of Ag degrades the layer continuity of the high Tc phase though slight improvement in the growth rate of high Tc phase was observed.
KeywordsCritical Current Density Alternative Magnetic Field Oxide Superconductor Powder Method Fracture Cross Section
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