Comparative Studies of MgB2/Mg Nano-Composites and Press-Sintered MgB2 Pellets

Published

June 1, 2003

Author(s)

Q Li, L Wu, Y Zhu, A R. Moodenbaugh, G Gu, M Suenaga, Z X. Ye, Daniel A. Fischer

Abstract

We present our studies of superconducting and microstructural properties of bulk MgB₂/Mg nano-composites and press-sintered MgB₂. TEM investigation revealed that the composites are very dense, consisting of nano-sized MgB₂ grains connected by the well-defined clean grain boundaries (GB). Both amorphous and structural intact GBs were observed in thepress-sintered samples. Magnetization and transport measurements showed that the composite carried over 1 MA/cm² critical current density (Jc) at 5 K and self-field, while the pressed sintered MgB₂ has Jc approximately} 0.25 MA/cm² at 5 K and self-field. The origin of substantially higher Jc found in the composites is mostly due to their nano-sized grains and cleangrain boundaries.

Citation

IEEE Transactions on Applied Superconductivity

Volume

13

Issue

No. 2

Pub Type

Journals

Keywords

critical current, grain boundaries, MgB₂ superconductors, nano-composites

Citation

Li, Q. , Wu, L. , Zhu, Y. , Moodenbaugh, A. , Gu, G. , Suenaga, M. , Ye, Z. and Fischer, D. (2003), Comparative Studies of MgB₂/Mg Nano-Composites and Press-Sintered MgB₂ Pellets, IEEE Transactions on Applied Superconductivity (Accessed October 21, 2025)