scholarly journals High transport critical current density obtained for powder-in-tube-processed MgB2 tapes and wires using stainless steel and Cu–Ni tubes

2001 ◽  
Vol 79 (15) ◽  
pp. 2435-2437 ◽  
Author(s):  
H. Kumakura ◽  
A. Matsumoto ◽  
H. Fujii ◽  
K. Togano
Keyword(s):  
Stainless Steel ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Transport Critical Current Density ◽  
Powder In Tube

scholarly journals Effect of Nanosized NiF2Addition on the Transport Critical Current Density of Ag-Sheathed (Bi1.6Pb0.4)Sr2Ca2Cu3O10Superconductor Tapes

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
M. Hafiz ◽  
R. Abd-Shukor
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Flux Pinning ◽  
Flux Line ◽  
Transport Critical Current Density ◽  
Pinning Centers ◽  
Sintering Time ◽  
Line Network ◽  
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We report the effect of NiF2(10 nm) additions on the transport critical current density,Jcof (Bi1.6Pb0.4)Sr2Ca2Cu3O10/Ag sheathed superconductor tapes. Pellets of (Bi1.6Pb0.4)Sr2Ca2Cu3O10(NiF2)x(x=0–0.05 wt.%) superconductor were prepared using the acetate coprecipitation method. The sample with 0.04 wt.% addition of NiF2exhibited the highestJc. Ag-sheathed (Bi1.6Pb0.4)Sr2Ca2Cu3O10(NiF2)0.04superconductor tapes were fabricated using the powder-in-tube (PIT) method and sintered at 845°C for 50 and 100 h.Jcof nonadded tapes at 30 K sintered for 50 and 100 h was 6370 and 8280 A/cm2, respectively.Jcof (Bi1.6Pb0.4)Sr2Ca2Cu3O10(NiF2)0.04/Ag tape at 30 K sintered for 50 and 100 h was 14390 and 17270 A/cm2, respectively. In magnetic fields (0 to 0.7 T),Jcof the NiF2added tapes was also higher compared with the nonadded tape indicating that NiF2nanoparticles can act as effective flux pinning centers and longer sintering time improved the microstructure. A steeper increase inJcwas observed below 60 K in the NiF2added tapes which coincided with the Neel temperature,TNof nanosized NiF2(60 K). The pronounced enhancement ofJcwas attributed to the strong interaction between flux line network and the antiferromagnetic NiF2belowTN.

Effect of Various C Sources Co-Doping on Transport Critical Current Density and Grains-Connectivity of MgB2/Fe Tapes

2013 ◽  
Vol 745-746 ◽  
pp. 214-218
Author(s):  
Xi Feng Pan ◽  
Guo Yan ◽  
Xiang Hong Liu ◽  
Yong Feng ◽  
Ping Xiang Zhang ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Malic Acid ◽  
Flux Pinning ◽  
Transport Critical Current Density ◽  
Co Doping ◽  
The Poor ◽  
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In this paper, we have prepared a series of Fe sheathed MgB2 tapes with SiC, Malic acid and C9H11NO mono-and co-doping by in-situ powder-in-tube (PIT) method, and studied the effects of various C sources co-doping on transport critical current density and flux pinning of MgB2/Fe tapes. The results suggest by various C sources co-doping, the amount of C substitution for boron largely increase, comparing to SiC, Malic acid or C9H11NO mono-doped sample. For MgB2/Fe tapes with 5 mol% SiC+10 wt% Malic acid and 4 wt% C9H11NO+10 wt% Malic acid co-doping, the transport Jc at 4.2 K and 10 T are 14.8 and 13.5 kA/cm2, respectively, which are clearly higher than the Jc of these dopants mono-doped samples. Furthermore, it is found that at the 4 wt.% C9H11NO doped MgB2, the poor in-field Jc should be attributing to the cracks at grains boundary, which results in the bad grains-connectivity.

Enhanced transport critical current density in Sn-added SmFeAsO1−xFxtapes prepared by the PIT method

2017 ◽  
Vol 30 (6) ◽  
pp. 065004 ◽  
Author(s):  
Qianjun Zhang ◽  
Xianping Zhang ◽  
Chao Yao ◽  
He Huang ◽  
Dongliang Wang ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Transport Critical Current Density

Studies on Development of MgB2 Superconductor with Improved In-Field Critical Current Density

2010 ◽  
Vol 117 ◽  
pp. 63-68 ◽  
Author(s):  
Krishnankutty Vinod ◽  
Syamaprasad Upendran
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Natural Material ◽  
Bulk Superconductor ◽  
Mgb2 Wires ◽  
Heating Method ◽  
Self Heating ◽  
Critical Current Density Jc ◽  
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The present study focuses on the preparation of good quality MgB2 superconductor in bulk, wire/tape forms and on the improvement of in-field critical current density [JC(H)]. MgB2 bulk superconductor was prepared by a simple Powder-In-Sealed-Tube (PIST) method and MgB2 wires and tapes were prepared by the Powder-In-Tube (PIT) method. A novel electrical self-heating method was introduced for the preparation of Fe sheathed MgB2 wires and tapes. Burned Rice Husk (BRH), an inexpensive natural material is found to be one of the best additives for enhancing the in-field critical current density of MgB2. By selecting suitable combinations of additives a significant enhancement of the critical current density by 1-2 orders of magnitude were achieved for fields > 5 T, at 5-15 K.

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

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.

scholarly journals High critical current density in Ti-doped MgB2/Ta/Cu tape by powder-in-tube process

2002 ◽  
Vol 92 (12) ◽  
pp. 7341-7344 ◽  
Author(s):  
B. Q. Fu ◽  
Y. Feng ◽  
G. Yan ◽  
Y. Zhao ◽  
A. K. Pradhan ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Critical Current Density ◽  
Doped Mgb2 ◽  
Powder In Tube
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