Superconducting properties of NaCl doped MgB2 bulks fabricated by hot pressed sintering
Superconducting properties of NaCl doped MgB2 bulks fabricated by hot pressed sintering
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热压烧结制备 NaCl 掺杂 MgB2 块体的超导性能
DOI：
10.1016/j.jallcom.2019.06.206
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发表时间：
2019-09
影响因子：
6.2
通讯作者：
Zhao Yong
中科院分区：
文献类型：
--
作者：
Zheng Liang;Zhang Wenjie;Wang Qi;Zhang Hong;Yu Zhou;Cheng Cuihua;Zhang Yong;Lei Ming;Zhao Yong
MgB2bulks with NaCl doping amount ranging from 0–30 at% have been prepared by hot pressed sintering process. With the increase of NaCl doping amount, thecaxis lattice parameter of MgB2monotonously increases, indicating the substitution of Mg atoms by larger Na atoms. Meanwhile, the intensity of diffraction peaks of both NaCl and impurity phase of MgO increases. More compact morphology was found in the NaCl doped MgB2samples. The critical transition temperature (Tc) decreases from 38.2 K to 36.8 K with the increase of NaCl doping amount from 0 to 30 at%, and the corresponding transition width ofTc(ΔTc) increases from 0.5 K to 1.8 K. When the doping amount of NaCl is not exceeding 10 at%, theJcvalue is about 106A/cm2at 4.2 K, 3 T, and 5 × 105A/cm2at 10 K, 3T.Jcperformance of the 5 at% NaCl doped MgB2sample (NC05) reaches 6.8 × 105A/cm2at 20 K, 2T, which improves approximately 20% compared to the pure one, attributing to the better grain connectivity of MgB2and enhancement of flux pinning force by NaCl doping.
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