Excess Mg addition MgB2 /Fe wires with enhanced critical current density

Authors

Rong Zeng, University of WollongongFollow
Lin Lu, University of WollongongFollow
Wenxian Li, University of WollongongFollow
Jianli Wang, University of WollongongFollow
Dongqi Shi, University of WollongongFollow
Josip Horvat, University of WollongongFollow
S X. Dou, University of WollongongFollow
M Bhatia, Ohio State University, USA
M D Sumption, Ohio State University, USA
Edward W. Collings, Ohio State University, USAFollow
Jaimoo Yoo, University of WollongongFollow
Mike Tomsic, Hyper Tech Research Incorporated, USA
M Rindfleisch, Hyper Tech Research Incorporated, USA

RIS ID

24872

Publication Details

Zeng, R, Lu, L, Li, W, Wang, J, Shi, D, Horvat, J, Dou, SX, Bhatia, M, Sumption, M, Collings, E, Yoo, J, Tomsic, M & Rindfleisch, M (2008), Excess Mg addition MgB2 /Fe wires with enhanced critical current density, Journal of Applied Physics, 103(8), 083911-1-083911-6.

Abstract

MgB₂ /Fe wires with 10 at. % excess Mg produced by in situ powder-in-tube processing werecompared to normal stoichiometric MgB₂ /Fe wires prepared by the same method. It was found thatthe critical current density J_c and the irreversibility field (H_irr) were significantly enhanced forMgB₂ /Fe wires with excess Mg. The transport J_c for 10 at. % Mg excess samples sintered at 800 degrees C, measured at a field of up to 14 T, increased by a factor of 2 compared to that for the normal MgB₂ wires. The best J_c results for the 10 at. % Mg excess sample were obtained by heating thesample at 600 degrees C for 1 h; the J_c at a field of 8 T and at temperature of 10 K reached 3104 A/cm2. The detailed analysis of the effect of excess Mg on the microstructures, the J_c, andthe H_irr, of MgB₂ /Fe wires are presented in this paper.