Title

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

RIS ID

116244

Publication Details

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.

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.

Grant Number

ARC/DE140101333

Please refer to publisher version or contact your library.

Share

COinS