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- Title
Flux Pinning and Superconducting Properties of Bulk MgB<sub>2</sub> with MgB<sub>4</sub> Addition.
- Authors
Miryala, Muralidhar; Arvapalli, Sai Srikanth; Diko, Pavel; Jirsa, Milos; Murakami, Masato
- Abstract
The improved performance of bulk MgB2 material with added nanometer‐sized MgB4 particles is presented. Bulk polycrystalline MgB2 samples with varying amount of MgB4x (x = 0, 1, 2, 3, 4, 5, and 10 wt%) are fabricated by solid‐state sintering at 775 °C for 3 h in pure argon gas. Microstructural studies indicate formation of nanometer‐sized grains when MgB4 is added. Density of nano‐grains is inversely proportional to the MgB4 content. The MgB2 sample with 1 wt% of MgB4 shows the best performance, with its self‐field critical current density reaching 385 and 315 kAcm−2 at 15 and 20 K, respectively. Flux pinning diagrams reveal the domination of grain boundary pinning mechanism.
- Subjects
FLUX pinning; BULK solids; NANOSTRUCTURED materials; CRITICAL currents; CRYSTAL grain boundaries; GRAIN refinement
- Publication
Advanced Engineering Materials, 2020, Vol 22, Issue 3, p1
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.201900750