Effect of Ta additions to bronze-processed Nb 3 Sn superconductors
Effect of Ta additions to bronze-processed Nb 3 Sn superconductors
复制标题
添加 Ta 对青铜加工 Nb 3 Sn 超导体的影响
DOI：
10.1109/tmag.1978.1059819
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
J. Livingston
中科院分区：
文献类型：
--
作者：
J. Livingston
已研究了 Nb(Ta) 丝与 Cu(Sn) 基体之间的反应结果，其丝成分范围为 0 至 34% Ta。微探针测量表明Ta完全融入反应层中，产生(Nb,Ta) 3 Sn三元A-15化合物。高 Ta 浓度导致反应动力学降低。随着 Ta 含量的增加，超导临界温度下降的速度比之前报道的粉末样品更快。然而，小 Ta 浓度会降低临界电流的场依赖性，并增加高场下的临界电流。这些效应被认为是由于电子平均自由程减小而产生的临界场增加造成的，并且可能被证明对于高场超导磁体的生产具有技术意义。
The results of reaction between Nb(Ta) filaments and a Cu(Sn) matrix have been studied for filament compositions ranging from 0 to 34 at pct Ta. Microprobe measurements show that the Ta is fully incorporated into the reaction layer, producing (Nb,Ta) 3 Sn ternary A-15 compounds. High Ta concentrations lead to a decrease in reaction kinetics. Superconducting critical temperatures decrease with increasing Ta content more rapidly than reported earlier for powder samples. However, small Ta concentrations produce a decreased field dependence of critical currents and an increase in critical currents at high fields. These effects are believed to result from increased critical fields produced by a decreased electron mean free path, and may prove to be of technological significance for the production of high-field superconducting magnets.