Magnetic Characterization of SiC Doped Bulk MgB₂ Superconductor

Abstract

Flux pinning is a very significant mechanism to improve critical current density in MgB₂ for many applications, such as developing the performance of wires and tapes. In this study, we have done a systematic study of SiC inclusions in the main matrix of MgB₂. Sample production in the form of MgB_2−x (SiC) _x was carried out by using solid state reaction method (x=0,0.01,0.02,0.04,0.06,0.10) in the argon atmosphere. The structural and magnetic properties of the prepared samples were investigated. Structural characterization of samples was performed by the X-ray powder diffraction (XRD) technique and the Scanning Electron Microscopy (SEM) measurements. Magnetic properties were determined by M–H loops, magnetization-temperature (M–T), and AC susceptibility measurements. The T _c of the samples was determined by the M–T measurements while the J _c is determined through the M–H measurements. SiC inclusions up to some ratios (x=0.06) increase the critical current density by up to about 50%, while the critical temperature T _c remains unchanged in compatible with the literature.