Chinese Science Bulletin

, Volume 51, Issue 21, pp 2669–2672 | Cite as

Doping effects of ZrC and ZrB2 in the powder-in-tube processed MgB2 tapes

  • Ma Yanwei 


We have investigated the effects of ZrC and ZrB2 doping on the superconducting properties of the powder-in-tube processed MgB2/Fe tapes. Samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM/EDX), transport and magnetic measurements. We confirmed the following quite different roles of ZrC and ZrB2 in MgB2. ZrC doping was found to decrease the transport critical current density (J c) at 4.2 K, while the critical temperature (T c) kept constant. In contrast, the J c values in magnetic fields were enhanced greatly by the ZrB2 addition, which resulted in a decrease in T c by only 0.5 K. The reason for different effects of two dopants is also discussed.


MgB2 superconducting tapes powder-in-tube critical current density doping 


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  1. 1.
    Nagamatsu J, Nakagawa N, Muranka T, et al. Superconductivity at 39 K in magnesium diboride. Nature, 2001, 410: 63–64CrossRefGoogle Scholar
  2. 2.
    Fu B Q, Feng Y, Yan G, et al. High critical current density in Ti-doped MgB2/Cu/Ta tape by powder-in-tube process. J Appl Phys, 2002, 92: 7341–7344CrossRefGoogle Scholar
  3. 3.
    Dou S X, Horvat J, Soltanian S, et al. Transport critical current density in Fe-sheathed nano-SiC doped MgB2 wires. Supercond Sci Techn, 2004, 17: 717–720CrossRefGoogle Scholar
  4. 4.
    Zhao Y, Cheng C H, Rui X F, et al. Improved irreversibility behavior and critical current density in MgB2-diamond nanocomposites. Appl Phys Lett, 2003, 83: 2916–2918CrossRefGoogle Scholar
  5. 5.
    Ma Y W, Kumakura H, Matsumoto A, et al. Microstucture and high critical current density of in situ processed MgB2 tapes made by WSi2 and ZrSi2 doping. Appl Phys Lett, 2003, 83: 1181–1183CrossRefGoogle Scholar
  6. 6.
    Ma Y W, Zhang X, Xu A, et al. The effect of ZrSi2 and SiC doping on the microstructure and J c-B properties of PIT processed MgB2 tapes. Supercond Sci Techn, 2006, 19: 133–137CrossRefGoogle Scholar
  7. 7.
    Kim K H, Shim K B. The effect of lanthanum on the fabrication of ZrB2-ZrC composites by spark plasma sintering. Mater Charact, 2003, 50: 31–37CrossRefGoogle Scholar
  8. 8.
    Shields T C, Kawano K, Holdom D, et al. Microstructure and superconducting properties of hot isostatically pressed MgB2. Supercond Sci Techn, 2002, 15: 202–205CrossRefGoogle Scholar
  9. 9.
    Narozhnyi V N, Fuchs G, Handstein A, et al. Comparative study of dense bulk MgB2 materials prepared by different methods. J Supercond, 2002, 15: 599–601Google Scholar

Copyright information

© Science in China Press 2006

Authors and Affiliations

  • Ma Yanwei 
    • 1
  1. 1.Applied Superconductivity Laboratory, Institute of Electrical EngineeringChinese Academy of SciencesBeijingChina

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