实现MgB2导体的高连接性：原位还是非原位烧结？
Towards the Realization of Higher Connectivity in MgB2 Conductors: In-situ or Sintered Ex-situ?
摘要：
两种最常见的MgB 2导体制造技术-原位和非原位-显示出关于连接性（有效载流横截面积）的越来越多的冲突。原位反应产生一个强的晶粒间耦合与低的填充因子，而使用预反应的MgB 2的异位过程产生紧密堆积的晶粒，但是，他们的耦合要弱得多。研究了常压下不同加热条件下非原位合成的MgB 2块材的正常态电阻率和显微结构。在约900°C的中等高温下长时间加热的样品显示出增加的填充因子、更大的晶粒间接触面积和显著降低的电阻率，所有这些都表明MgB 2的固态自烧结。因此，烧结的非原位样品的连通性超过原位样品的典型连通性范围5-15%。我们的研究结果表明，自烧结开发了优越的连接潜力的非原位MgB 2，虽然它的晶间耦合尚未完成，提供了一个强大的可能性，最佳烧结的非原位MgB 2比原位MgB 2的两倍甚至更高的连接。
英文摘要：
The two most common types of MgB2 conductor fabrication technique - in-situ and ex-situ - show increasing conflicts concerning the connectivity, an effective current-carrying cross-sectional area. An in-situ reaction yields a strong intergrain coupling with a low packing factor, while an ex-situ process using pre-reacted MgB2 yields tightly packed grains, however, their coupling is much weaker. We studied the normal-state resistivity and microstructure of ex-situ MgB2 bulks synthesized with varied heating conditions under ambient pressure. The samples heated at moderately high temperatures of ~900°C for a long period showed an increased packing factor, a larger intergrain contact area and a significantly decreased resistivity, all of which indicate the solid-state self-sintering of MgB2. Consequently the connectivity of the sintered ex-situ samples exceeded the typical connectivity range 5-15% of the in-situ samples. Our results show self-sintering develops the superior connectivity potential of ex-situ MgB2, though its intergrain coupling is not yet fulfilled, to provide a strong possibility of twice or even much higher connectivity in optimally sintered ex-situ MgB2 than in in-situ MgB2.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
