Development of Doped MgB2 Wires and Tapes for Practical Applications

TL;DR

This review discusses how various carbon-based dopants enhance the superconducting properties of MgB2 wires and tapes, focusing on critical current density improvements through lattice doping and flux pinning mechanisms.

Contribution

It provides a comprehensive analysis of carbon doping effects on MgB2, including experimental results and principles for dopant selection, advancing practical superconductor development.

Findings

Carbon doping significantly enhances Bc2 and Jc in MgB2.

Nano-sized inclusions act as flux pinning centers.

Dopant selection principles improve superconductor performance.

Abstract

A review of current developments in the study of chemical doping effect on the superconducting properties of MgB2 wires and tapes is presented, based on the known literature data and our own results. The critical current density of MgB2 can be improved through various kinds of dopants. Among these dopants, doping with carbon-containing materials seems to be the most effective way to improve the Jc performance. The doping effect of carbon in different forms and carbon-based compounds such as SiC, nano-C, metal carbides, as well as aromatic hydrocarbon and carbohydrate on the Jc-B characteristics of MgB2 was discussed in detail. The C can be incorporated into the MgB2 crystal lattice by replacing boron, and thus Bc2 is significantly enhanced due to selective tuning of impurity scattering of two bands in the two-band MgB2. Besides the efforts of increasing Bc2 by carbon doping, the fine grain size and nano-size inclusions caused by doping would create many flux pinning centres improving the Jc-B property of MgB2. Based on these considerations, we suggested some principles for the selection of dopants.