| Doping effects of ZrC and ZrB2 in the powder-in-tube processed MgB2 tapes |
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| 作者姓名： | MA Yanwei |
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| 作者单位： | MA Yanwei Applied Superconductivity Laboratory，Institute of Electrical Engineer ing，Chinese Academy of Sciences，Beijing 100080，China |
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| 基金项目： | Acknowledgements The author would like to thank Prof. Kumakura H at NIMS, Japan for financial support and Dr. Matsumoto A for kind assistance during experiments. This work was supported by the National Natural Science Foundation of China （Grant No. 50472063）. |
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| 摘 要： | We have investigated the effects of ZrC and ZrB2 doping on the superconducting properties of the powder-in-tube processed MgB2/Fe tapes. Sam- ples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM/EDX), transport and magnetic measurements. We confirmed the fol- lowing quite different roles of ZrC and ZrB2 in MgB2. ZrC doping was found to decrease the transport critical current density (Jc) at 4.2 K, while the critical temperature (Tc) kept constant. In contrast, the Jc values in magnetic fields were enhanced greatly by the ZrB2 addition, which resulted in a decrease in Tc by only 0.5 K. The reason for different effects of two dopants is also discussed.
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| 关 键 词： | MgB2 超导体 临界电流密度 掺杂 ZrC ZrB2 |
| 文章编号： | 10.1007/s11434-006-2155-4 |
| 收稿时间： | 2005-12-12 |
| 修稿时间： | 2005-12-122006-04-13 |
Doping effects of ZrC and ZrB2 in the powder-in-tube processed MgB2 tapes |
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| MA Yanwei.Doping effects of ZrC and ZrB2 in the powder-in-tube processed MgB2 tapes[J].Chinese Science Bulletin,2006,51(21):2669-2672. |
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| Authors: | Yanwei Ma |
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| Institution: | (1) Applied Superconductivity Laboratory, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, 100080, China |
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| Abstract: | We have investigated the effects of ZrC and ZrB2 doping on the superconducting properties of the powder-in-tube processed MgB2/Fe tapes. Sam- ples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM/EDX), transport and magnetic measurements. We confirmed the fol- lowing quite different roles of ZrC and ZrB2 in MgB2. ZrC doping was found to decrease the transport critical current density (Jc) at 4.2 K, while the critical temperature (Tc) kept constant. In contrast, the Jc values in magnetic fields were enhanced greatly by the ZrB2 addition, which resulted in a decrease in Tc by only 0.5 K. The reason for different effects of two dopants is also discussed. |
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| Keywords: | MgB_2 superconducting tapes powder-in-tube critical current density doping |
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