Flux pinning mechanisms of (YBa2Cu3Oy-d)1−x/(Dy2O3)x superconductors (x=0.1 and 0.5 wt%). Issue 5 (1st March 2021)

• Record Type: Journal Article
• Authors: Algarni, R.; Hannachi, E.; Slimani, Y.; Almessiere, M.A.; Ben Azzouz, F.
• Is Part Of: Ceramics international. Volume 47:Issue 5(2021)
• Page Start: 6675
• Page End: 6682
• Publication Date: 2021-03-01
• Subjects: YBa2Cu3O7-D superconductor -- Dy2O3 nanoparticles -- Critical current density -- Flux pinning -- B-T phase diagram; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.11.007
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Polycrystalline (YBa2 Cu3 Oy-d )1−x /(Dy2 O3 )x superconductor samples were produced through the solid-state reaction route and by adding amounts of x = 0.1 and 0.5 wt% of Dy2 O3 nanoparticles (NP-Dy2 O3 with a size of about 10 nm) during the second stage of heat treatment. The structural, microstructural, critical current density and pinning properties were investigated using x-ray diffraction, scanning electron microscope, and DC magnetization at various temperatures ranging from 77 down to 10 K and under an applied magnetic field varying between −6 and +6 Tesla. Both samples crystallize in the orthorhombic structure. It was found that the Dy2 O3 nanoparticles reside in the grain boundaries. Although the sample with 0.5 wt% NP-Dy2 O3 is characterized by a low zero resistive temperature of about 78 K that is close to the useful temperature for technological applications, it showed the highest Jc values and the excellent flux pinning capacity. The addition of an appropriate amount of NP-Dy2 O3 up to 0.5 wt% extends the single bundle pinning regime and retards the liquid vortex regime.