Transport critical current density of (Bi1.6Pb0.4)Sr2Ca2Cu3O10/Ag superconductor tapes with addition of nanosized CoFe2O4

Abstract

The effect of nanosized CoFe 2 O 4 (60 nm) addition on the transport critical current density, J c , of (Bi 1.6 Pb 0.4 )Sr 2 Ca 2 Cu 3 O 10 (CoFe 2 O 4 ) x (x = 0-0.05 wt%) superconductor prepared by the co-precipitation method was investigated. The optimal J c (measured using the fourpoint probe method) was observed in the x = 0.01 wt% pellets. Using this optimal wt%, Ag-sheathed (Bi 1.6 Pb 0.4 )-Sr 2 Ca 2 Cu3O 10 (CoFe 2 O 4 ) 0.01 superconductor tapes were fabricated using the powder-in-tube method. The tapes were sintered for 50 and 100 h at 845°C. The phase and microstructure of the samples were determined using the powder X-ray diffraction method and scanning electron microscopy, respectively. The temperature dependence of J c for the tapes in various applied magnetic fields was also measured.

Effect of Co_0.5Ni_0.5Fe₂O₄ Nanoparticles Addition in Ag-Sheathed Bi-2223 Superconductor Tapes Prepared by Co-Precipitation Method

“…The coherence length of Bi-2223 is around 2.9 nm and the penetration depth is between 60 and 1000 nm [9]. Agsheathed Bi-2223 tapes with addition of Bi2O3, PbO, Fe3O4, CoFe2O4, MgO, NiO, Co3O4 and NiF2 nanoparticles within this range were found to have higher Jc compared to pure Bi-2223 tapes [10][11][12][13][14][15][16][17].…”