High Critical Current Density of Nanostructured MgB2 Bulk Superconductor Densified by Spark Plasma Sintering

Yiteng Xing, Pierre Bernstein, Muralidhar Miryala, Jacques G. Noudem

Research output: Contribution to journalArticlepeer-review

Abstract

In situ MgB2 superconducting samples were prepared by using the spark plasma sintering method. The density of the obtained bulks was up to 95% of the theoretical value predicted for the material. The structural and microstructural characterizations of the samples were investigated using X-ray diffraction and SEM and correlated to their superconducting properties, in particular their critical current densities, Jc, which was measured at 20 K. Extremely high critical current densities of up to 6.75 × 105 A/cm2 in the self-field and above 104 A/cm2 at 4 T were measured at 20 K, indicating that vortex pinning is very strong. This property is mainly attributed to the sample density and MgB2 nanograins in connection to the presence of MgO precipitates and areas rich in boron.

Original languageEnglish
Article number2583
JournalNanomaterials
Volume12
Issue number15
DOIs
Publication statusPublished - 2022 Aug

Keywords

  • critical current density
  • MgB
  • nano grains
  • spark plasma sintering
  • superconductivity

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)

Cite this