Extrinsic Two-Dimensional Flux Pinning Centers in MgB2 Superconductors Induced by Graphene-Coated Boron

ACS Applied Materials & Interfaces
Wenxian LiBin Liu

Abstract

Extrinsic two-dimensional flux pinning centers, via graphene-encapsulated boron powder as precursors, have been introduced into MgB2 superconductors by means of in situ and diffusion sintering methods. Uniform graphene encapsulation of the boron powders was achieved by the hydrothermal method with highly dispersed graphene oxide as the precursor. The graphene coating layers induce remaining graphene layers and other defects acting as flux pinning centers in the matrix as well as improved connectivity in between grains. The increased critical current density ( Jc) is attributed to the enhanced flux pinning force and improved connectivity. Two-dimensional flux pinning centers provided by thin graphene layers and grain boundaries in MgB2 possess high flux pinning efficiency without suppressing the connectivity of the MgB2 superconductor.

References

Mar 10, 2001·Nature·J NagamatsuJ Akimitsu
May 1, 2001·Physical Review Letters·J M An, W E Pickett
May 2, 2003·Nature·S SoumaK Kadowaki
Jul 13, 2004·Physical Review Letters·R H T WilkeS T Hannahs
Feb 9, 2005·Physical Review Letters·Jens KortusAlexander A Golubov
Jan 1, 2009·Nanoscale Research Letters·Liang ShiYitai Qian
Oct 1, 2011·Advanced Materials·Jung Ho KimShi Xue Dou

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Citations

Jan 6, 2021·ACS Applied Materials & Interfaces·Dipak PatelJung Ho Kim
Jan 24, 2020·ACS Applied Materials & Interfaces·Haobo LiuWenxian Li

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