Study of Superconducting, Structural, and Thermal Properties of SnO2 Added MgB2 Bulks.
Study of Superconducting, Structural, and Thermal Properties of SnO2 Added MgB2 Bulks.
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添加 SnO2 的 MgB2 块体的超导、结构和热性能研究。
DOI：
10.1109/tasc.2019.2905436
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Rindfleisch,MatthewA
中科院分区：
文献类型：
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作者：
Zhang,Danlu;Sumption,MikeD;Collings,EdwardWilliam;Thong,CheeJ;Rindfleisch,MatthewA
采用原位法制备了一系列添加sno2的MgB2块状超导体，研究了氧掺杂对MgB2超导性能和结构性能的影响。制备了几种（MgB2）1-x（SnO2）样品，x的重量范围为0,3 wt%， 4 wt%和6 wt%。采用物性测量系统测量上临界场（Bc2）和不可逆场（Birr）。对收到的sno2粉末进行了热分析。在4.2 K下用磁测量得到临界电流密度（Jcm）。x射线衍射结果表明，所有掺杂样品均发生sno2完全分解，mgb2晶格中a轴发生移位。在热处理过程中，氧被成功释放，但没有看到bc2或birr的增强，这表明氧原子没有最终进入宿主晶格。为了在主晶格上得到氧取代，还需要进一步探索不同的处理方法。
A series of SnO2added MgB2bulk superconductors were prepared by in situ route to study the effect of oxygen doping on superconducting and structural properties of MgB2. Several (MgB2)1-x(SnO2)xsamples were fabricated with x ranging from 0, 3 wt%, 4 wt%, and 6 wt%. Upper critical field (Bc2) and irreversible field (Birr) were measured by physical property measurement system. Thermal analysis was performed on the as-received SnO2powder. Critical current densities (Jcm) were obtained at 4.2 K using magnetic measurement. X-ray diffraction results showed evidence of full SnO2decomposition in all the doped bulk samples and a shift of a-axis in MgB2lattice was seen. Oxygen was successfully released during heat treatment, yet no enhancement of BC2or Birrwas seen, indicating that oxygen atoms did not end up in the host lattice. Further exploration of different processing procedures is still needed in order to get oxygen substitution on the host lattice sites.