Abstract
The influence of C6H16N2 addition on the microstructural and superconducting properties of MgB2 was systematically investigated. Unlike previously reported carbon sources, the C6H16N2 additive had no effect on the lattice parameters of MgB2. However, the obvious improvement of critical current density (Jc) was obtained for C6H16N2 added MgB2 without carbon substitution for boron. The average grain size was reduced with the addition of C6H16N2. Additionally, different numbers of spherical MgB2 grains appeared inside the C6H16N2 added MgB2. As the added amount of C6H16N2 increased, the active cross-sectional area fraction (AF) values first increased then decreased. The possible reasons for these results have been discussed. The additive C6H16N2 resulted in a small depression in Tc and slightly increased the ΔTc of MgB2 at 0 T. The Hc2 (T) and Hirr (T) values of C6H16N2 added MgB2 samples are larger than those of pure MgB2 at temperatures below 25 K. It was concluded that the reduced grain size and the improved grain connectivity were mainly correlated with the enhancement of the Jc, Fp, Hc2, and Hirr performances in C6H16N2 added MgB2 superconductors.
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