Effect of Mg/B ratio on the superconductivity of MgB2 bulk with SiC addition

Authors

Yun Zhang, University of WollongongFollow
S X. Dou, University of WollongongFollow
Cheng Lu, University of WollongongFollow
Sihai Zhou, University of WollongongFollow
Wenxian Li, University of WollongongFollow

RIS ID

31880

Publication Details

Dou, S. Xue., Li, W., Zhou, S., Lu, C. and Zhang, Y. (2010). Effect of Mg/B ratio on the superconductivity of MgB₂ bulk with SiC addition. Physical Review B (Condensed Matter and Materials Physics), 81 (9), 094501-1-094501-7.

Abstract

To improve the self-field critical current density (J_c) and critical temperature (T_c) in SiC-doped MgB₂, optimization of the nominal Mg/B mixing ratio has been performed. The effects of the nominal Mg/B mixing ratio (x:2) on the superconductivity, Raman spectra, current transport properties, and flux pinning mechanisms in MgB₂ with 10 wt.% SiC doping were investigated systematically, with x varied from 1 to 1.2. It has been found that the sample with the Mg/B ratio of 1.15:2 exhibited the best J_c performance for all fields (0–8.5 T), and its T_c was also enhanced. The optimized Mg/B ratio diminished the interband scattering caused by Mg or B vacancies, and in turn, increased T_c. The connectivity and disorder were increased in the Mg_1.15B₂ sample. Both of these were responsible for the improved J_c under all the fields examined.

Grant Number

ARC/DP0770205

Additional Grant Number

http://purl.org/au-research/grants/ARC/DP0770205