Transport current density of Ag-sheathed superconductor tapes using Bi-Sr-Ca-Cu-O powders prepared by the co-precipitation method

The powder-in-tube MgB2 wires were prepared by high energy milling of Mg and B powder. The powder was not mechanically alloyed for 2h short milling time. However, the MgB2 grains in wires were very small (20~100nm) and resemble the dimple after post-heat treatment. The clear evidence for transcrystlline fracture was observed. It indicated that the grain connection was greatly improved and the fluxing pinning was significantly enhanced. Another point to view was no intermediate annealing during the whole rolling process. The influence of the post-heat treatment on the transport current density was studied. Despite the lower Tc of about 35K, the transport current density reached to 3×104A/cm2 at 15K and 3.5T for wires sintered at 700°C.

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Effect of the Ball-Milling Technique on the Transport Current Density of Polycrystalline Superconductor YBa 2 Cu 3 O y -Pinning Mechanism

Journal of Superconductivity and Novel Magnetism ◽

10.1007/s10948-014-2746-2 ◽

2014 ◽

Vol 28 (2) ◽

pp. 493-498 ◽

Cited By ~ 11

Author(s):

E. Hannachi ◽

A. Hamrita ◽

Y. Slimani ◽

M. K. Ben Salem ◽

M. Zouaoui ◽

...

Keyword(s):

Ball Milling ◽

Current Density ◽

Transport Current ◽

Pinning Mechanism ◽

Ball Milling Technique ◽

Transport Current Density

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Effect of Co0.5Ni0.5Fe2O4 Nanoparticles Addition in Ag-Sheathed Bi-2223 Superconductor Tapes Prepared by Co-Precipitation Method

Materials Science Forum ◽

10.4028/www.scientific.net/msf.981.59 ◽

2020 ◽

Vol 981 ◽

pp. 59-65

Author(s):

Muhammad Hafiz Mazwir ◽

Bryan Andrew Balasan ◽

Farah Hanani Zulkifli ◽

Roslan Abd-Shukor

Keyword(s):

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Precipitation Method ◽

X Ray Diffraction ◽

Magnetic Oxide ◽

Pinning Centers ◽

X Ray ◽

Co Precipitation ◽

Powder In Tube

Effect of complex magnetic oxide Co0.5Ni0.5Fe2O4 (CNFO) nanoparticles addition in (Bi1.6Pb0.4)Sr2Ca2Cu3O10 (Bi-2223) superconductor tapes was investigated. Ultrafine Bi-2223 powder precursor was prepared via co-precipitation method and was added with 0.01 – 0.05 wt.% Co0.5Ni0.5Fe2O4 nanoparticles during the final heating stage. The sample with 0.01 wt.% addition, Bi-2223(CNFO)0.01 was found to have the highest critical current density, Jc. This sample were then chosen to be fabricated into Ag-sheathed superconductor tapes using the powder-in-tube (PIT) method. The tapes were sintered for 50 and 100 h at 845 °C. The phase, microstructure and Jc of the samples were determined by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and four point probe, respectively. Jc of Ag-sheathed Bi-2223(CNFO)0.01 tapes sintered for 100 h was 19830 A/cm2 at 30 K and 3970 A/cm2 at 77 K compared to tapes without addition which showed a much lower Jc(6370 A/cm2 at 30 K). This study showed that CNFO nanoparticles could act as an effective flux pinning centers to enhance the critical current density in the Bi-2223 superconductor.

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