Improved critical current properties observed in MgB2 bulks synthesized by low-temperature solid-state reaction
Improved critical current properties observed in MgB2 bulks synthesized by low-temperature solid-state reaction
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DOI：
10.1088/0953-2048/18/1/019
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发表时间：
2004
影响因子：
3.6
通讯作者：
A. Yamamoto;J. Shimoyama;S. Ueda;Y. Katsura;S. Horii;K. Kishio
中科院分区：
文献类型：
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作者：
A. Yamamoto;J. Shimoyama;S. Ueda;Y. Katsura;S. Horii;K. Kishio
用镁和硼在600℃下的固相反应合成了MgB_2块材，并与在850℃加热的样品的超导性能进行了比较。600℃加热的样品在20K的高场下表现出改善的临界电流特性，结晶度差有助于在高场下增强HC2，Hirr和Jc的超导性能。另一方面，较强的颗粒连接网络结构和较小的颗粒尺寸是导致低场下高JC的原因。将Jc提高到3.93×105A cm−2和高μ0Hirr，对于未掺杂的块体来说，这保证了低温烧结是一种很有前途的制备高临界电流性能的方法。
MgB2 bulks were synthesized by the solid-state reaction of Mg and B at 600 °C and their superconducting properties were compared with samples heated at 850 °C. The samples heated at 600 °C exhibited improved critical current properties up to high fields at 20 K. Poor crystallinity is found to contribute enhancement of Hc2, Hirr and Jc at high fields. On the other hand, the strongly grain connected network structure and smaller grain size are responsible for high Jc at low fields. Improved Jc up to 3.93 × 105 A cm−2 and a high μ0Hirr of T, as for undoped MgB2 bulks, guarantees that low-temperature sintering is a promising way to fabricate MgB2 conductors with high critical current performance.