C katkılandırılmış MgB2 süper iletkeninin fiziksel özellikleri

Abstract

Flux pinning is an important issue to enhance critical current density in MgB2 for large scale applications, for example wires and tapes. In this study we have done a systematic study of C inclusions in the main matrix of MgB2 . To study the effect of C doping in MgB2, various powders of C were added to the main matrix of MgB2 as MgB2-xCx with varying from 0 to 0.1 and optimum sample preparation techniques with solid state reaction method were then applied in Ar atmosphere. For structural characterization, XRD patterns were measured. With increasing C content, minor phases were reported to be formed. For magnetic characterization, M-T, M-H, and AC susceptibility measurements were performed on structurally characterized samples. Magnetization measurements for C doped samples showed that, critical current density decreases uniformly with Carbon content, while negligible variation in critical temperature have been observed. We compared our magnetic data with the theoretical models. Also another samples were prepared by ball-milling. And they had better results on the superconductor properties. And also TC decreased between 2-5 K.