arXiv subjects

X. F. Rui

Publications and source records attributed to X. F. Rui.

2 recordsLinked to original sources

arXiv2003

Improved Irreversibility Behaviour and Critical Current Density in MgB2-Diamond Nanocomposites

MgB2-diamond nanocomposite superconductors have been synthesized by addition of nano-diamond powder. Microstructural analysis shows that the nanocomposite superconductor consists of tightly-packed MgB2 nano-grains (~50-100 nm) with highly-dispersed and uniformly-distributed diamond nanoparticles (~10-20 nm) inside the grains. The Jc-H and Hiir-T characteristics have been significantly improved in this MgB2-diamond nanocomposite, compared to MgB2 bulk materials prepared by other techniques. Also, the Jc value of 1x104 A/cm2 at 20 K and 4 T and the Hirr value of 6.4 T at 20 K have been achieved

cond-mat.supr-con↗

arXiv2003

Doping Effect of Nano-Diamond on Superconductivity and Flux Pinning in MgB2

Doping effect of diamond nanoparticles on the superconducting properties of MgB2 bulk material has been studied. It is found that the superconducting transition temperature Tc of MgB2 is suppressed by the diamond-doping, however, the irreversibility field Hirr and the critical current density Jc are systematically enhanced. Microstructural analysis shows that the diamond-doped MgB2 superconductor consists of tightly-packed MgB2 nano-grains (~50-100 nm) with highly-dispersed and uniformly-distributed diamond nanoparticles (~10-20 nm) inside the grains. High density of dislocations and diamond nanoparticles may take the responsibility for the enhanced flux pinning in the diamond-doped MgB2.

cond-mat.supr-con↗