Bo Zheng;Wei Xie;Yuhao Liu;Xiyu Zhu;Xue Ming;Yuhang Zhang;Hai-Hu Wen
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Optimization of Magnetic Stability in Nb3Sn Materials Near Stoichiometric Composition
Using a solid-state reaction method starting with Nb and Nb
6
Sn
5
powders, we have synthesized bulk Nb
3
Sn samples with uniformly distributed Sn contents of 24%, 25%, and 25.6%. Among them, the sample with Sn content = 25% may go through a structural phase transition from cubic to tetragonal structure at a low temperature of 43 K. The X-ray diffraction and resistivity measurements show systematic changes in samples with three different Sn contents. We found that the highest
Tc
is located in the sample with exactly stoichiometric composition (Sn content = 25%), which may be due to the tetragonal structure. In addition, properties of flux jumps under various physical conditions in Nb
3
Sn materials are investigated through magnetization measurements, and significant suppression to flux jumps was found in samples with slightly higher Sn content (Sn content ≈25.6%) and better compactness and grain refinement.
期刊介绍：
IEEE Transactions on Applied Superconductivity (TAS) contains articles on the applications of superconductivity and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Large scale applications include magnets for power applications such as motors and generators, for magnetic resonance, for accelerators, and cable applications such as power transmission.
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