Development of rectangular Bi(2223) wires with reduced anisotropy
Development of rectangular Bi(2223) wires with reduced anisotropy
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开发具有降低各向异性的矩形 Bi(2223) 线
DOI：
10.1088/0953-2048/10/4/008
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发表时间：
1997
影响因子：
3.6
通讯作者：
R. Flükiger
中科院分区：
文献类型：
--
作者：
G. Grasso;R. Flükiger
为了降低各向异性对液氮温度下输运性质的影响，采用一种新的细丝矩形结构制备了银包套多丝Bi(2223)线材。目前，在横截面为矩形的轧制线材上，已在77K时实现了20.5kA的临界电流密度。已测量了输运性质随外加磁场及其相对于线材取向的变化。与单丝Bi(2223)带材（作为参考测量，其临界电流密度值为34.5kA）相比，新的矩形线材显示出明显降低的各向异性。对于标准带材，当沿带材法线方向施加0.5T的磁场时临界电流密度降为零，而新开发的线材显示出相当大的优势：无论磁场方向如何，在77K时，矩形线材在超过0.8T的磁场下临界电流密度才降为零。
Ag-sheathed multifilamentary Bi(2223) wires have been prepared with a new rectangular configuration of the filaments conceived in order to reduce the effect of anisotropy on the transport properties at the liquid nitrogen temperature. At present, critical current densities at 77 K of 20.5 kA have been achieved on rectangular rolled wires of cross-section. The transport properties have been measured as a function of the applied field and of its orientation with respect to the wire. The new rectangular wires have shown a clearly reduced anisotropy compared to that of monofilamentary Bi(2223) tapes with a value of 34.5 kA , which have been measured as a reference. With respect to standard tapes, where vanishes at a magnetic field of 0.5 T applied along the tape normal, the newly developed wires show considerable advantages: regardless of the orientation of the field, of rectangular wires vanishes at fields exceeding 0.8 T at 77 K.