CrB2 Doping Effects on Critical Current Density and Flux Pinning of MgB2

CrB2 Doping Effects on Critical Current Density and Flux Pinning of MgB2

A series of polycrystalline bulk samples of (MgB 2 ) 1-x (CrB 2 ) x with 0 ≤ x ≤ 10% were synthesized by a two-step solid-state diffusion reaction. Crystal structure, microstructure, superconductivity, and flux pinning behavior were investigated. The CrB 2 dopant was found to significantly depress s...

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Veröffentlicht in:IEEE transactions on applied superconductivity 2019-03, Vol.29 (2), p.1-5
Hauptverfasser: Zhao, Yong, Ke, Chuan, Yang, Ye, Hsieh, Chang Chun, Zhou, Daijin, Cheng, Cuihua, Zhang, Yong
Format: Artikel
Sprache:eng
Schlagworte:
Borides
Bulk density
Chemical synthesis
Chromium borides
Critical current density
Crystal structure
Doping
Flux pinning
Impurities
Lattices
Magnesium compounds
Metals
MgB2 alloys
Nanoparticles
Powders
Superconductivity
Type II superconductors
X-ray scattering
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Zusammenfassung:A series of polycrystalline bulk samples of (MgB 2 ) 1-x (CrB 2 ) x with 0 ≤ x ≤ 10% were synthesized by a two-step solid-state diffusion reaction. Crystal structure, microstructure, superconductivity, and flux pinning behavior were investigated. The CrB 2 dopant was found to significantly depress superconductivity by substituting Mg with Cr. In addition, a portion of the unreacted CrB 2 appears as nanoparticle impurities inserted into the MgB 2 matrix, which enhances flux pinning. As a result, the critical current density of the (MgB 2 ) 1-x (CrB 2 ) x sample was significantly improved at low doping levels.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2018.2889636