Stress/strain induced flux pinning in highly dense MgB2 bulks

Authors

Rong Zeng, University of WollongongFollow
S X. Dou, University of WollongongFollow
Lin Lu, University of WollongongFollow
Wenxian Li, University of WollongongFollow
Chung-Kiak Poh, University of WollongongFollow
Jung Ho Kim, University of WollongongFollow
Josip Horvat, University of WollongongFollow
Dongqi Shi, University of WollongongFollow
Jianli Wang, University of WollongongFollow
Paul G. Munroe, The University of New South Wales
X. F. Wang, Electron Microscope Unit University of Sydney
Rongkun Zheng, University of Sydney
S. P. Ringer, University of Sydney
M Rindfleisch, Nuclear Hyper Tech Research, Inc
Mike Tomsic, Hyper Tech Research Incorporated, Columbus, OH, USA

RIS ID

31398

Publication Details

Zeng, R., Dou, S. Xue., Lu, L., Li, W., Poh, C., Kim, J., Horvat, J., Shi, D., Wang, J. L., Munroe, P. R., Wang, X. F., Zheng, R. K., Ringer, S., Rindfleisch, M. Tomsic, M. (2009). Stress/strain induced flux pinning in highly dense MgB₂ bulks. IEEE Transactions on Applied Superconductivity, 19 (3), 2722-2725.

Abstract

We have systematically studied the flux pinning behavior of MgB₂ bulks synthesized by direct diffusion of Mg into pressed pellets of high purity crystalline B powder, with and without mixing with C and SiC nanoparticles, at a reaction temperature of 850^degC for 10 hrs. All of the samples showed very high purity and high density, but their microstructure and flux pinning behavior showed significant differences. It was found that the pure MgB₂ agrees with the deltaT_c pinning model, nano-C doped MgB₂ agrees with the deltal pinning model, while the SiC+MgB₂ composite agrees with the deltaepsiv pinning model (stress/strain field pinning), since the dominant micro-defects that influence the flux pinning in these three samples are different.