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Enhancement of grain connectivity and critical current density in the ex-situ sintered MgB2 superconductors by doping minor Cu

Journal Article


Abstract


  • The influence of Cu addition on the microstructure and superconducting performance of ex-situ sintered MgB 2 is systemically studied. It is found that the critical current density (J c ) of the Cu-doped sample is improved compared to the un-doped samples. In particular, the J c of the Cu-doped sample sintered at 900 °C for only 10 min is the best value at low fields. The reason is that Cu addition can obviously promote the decomposition of MgB 2 : MgB 2 ↔MgB 4 +Mg, which produces more Mg that can then react with Cu, forming local Mg-Cu liquid at high temperature. The presence of this local Mg-Cu liquid can significantly enhance the migration and self-sintering of MgB 2 , leading to the significant improvement in the grain connectivity and J c . Our results indicate that Cu addition is a promising method to fabricate high-performance ex-situ MgB 2 bulks and wires.

UOW Authors


  •   Cheng, Fang (external author)
  •   Ma, Zongqing (external author)
  •   Liu, Chenxi (external author)
  •   Li, Hui Jun.
  •   Hossain, Md Shahriar
  •   Bando, Yoshio
  •   Yamauchi, Yusuke (external author)
  •   Fatehmulla, Amanullah (external author)
  •   Farooq, W Aslam. (external author)
  •   Liu, Yongchang (external author)

Publication Date


  • 2017

Citation


  • Cheng, F., Ma, Z., Liu, C., Li, H., Hossain, M., Bando, Y., Yamauchi, Y., Fatehmulla, A., Farooq, W. Aslam. & Liu, Y. (2017). Enhancement of grain connectivity and critical current density in the ex-situ sintered MgB2 superconductors by doping minor Cu. Journal of Alloys and Compounds, 727 1105-1109.

Scopus Eid


  • 2-s2.0-85028506605

Number Of Pages


  • 4

Start Page


  • 1105

End Page


  • 1109

Volume


  • 727

Place Of Publication


  • Netherlands

Abstract


  • The influence of Cu addition on the microstructure and superconducting performance of ex-situ sintered MgB 2 is systemically studied. It is found that the critical current density (J c ) of the Cu-doped sample is improved compared to the un-doped samples. In particular, the J c of the Cu-doped sample sintered at 900 °C for only 10 min is the best value at low fields. The reason is that Cu addition can obviously promote the decomposition of MgB 2 : MgB 2 ↔MgB 4 +Mg, which produces more Mg that can then react with Cu, forming local Mg-Cu liquid at high temperature. The presence of this local Mg-Cu liquid can significantly enhance the migration and self-sintering of MgB 2 , leading to the significant improvement in the grain connectivity and J c . Our results indicate that Cu addition is a promising method to fabricate high-performance ex-situ MgB 2 bulks and wires.

UOW Authors


  •   Cheng, Fang (external author)
  •   Ma, Zongqing (external author)
  •   Liu, Chenxi (external author)
  •   Li, Hui Jun.
  •   Hossain, Md Shahriar
  •   Bando, Yoshio
  •   Yamauchi, Yusuke (external author)
  •   Fatehmulla, Amanullah (external author)
  •   Farooq, W Aslam. (external author)
  •   Liu, Yongchang (external author)

Publication Date


  • 2017

Citation


  • Cheng, F., Ma, Z., Liu, C., Li, H., Hossain, M., Bando, Y., Yamauchi, Y., Fatehmulla, A., Farooq, W. Aslam. & Liu, Y. (2017). Enhancement of grain connectivity and critical current density in the ex-situ sintered MgB2 superconductors by doping minor Cu. Journal of Alloys and Compounds, 727 1105-1109.

Scopus Eid


  • 2-s2.0-85028506605

Number Of Pages


  • 4

Start Page


  • 1105

End Page


  • 1109

Volume


  • 727

Place Of Publication


  • Netherlands