Effect of Co doping on the transport critical current density of rapidly heat-treated filamentary (Nd,Sm,Gd)–Ba–Cu–O superconductors

2017 ◽  
Vol 539 ◽  
pp. 44-48
Author(s):  
Y. Ikebe ◽  
S. Awaji ◽  
E. Ban
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Transport Critical Current Density ◽  
Co Doping ◽  
Heat Treated

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 ◽  
Powder In Tube

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

Degradation of YBC critical current as a result of annealing in air

1993 ◽  
Vol 8 (5) ◽  
pp. 943-944 ◽  
Author(s):  
Judith Bransky
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Standard Method ◽  
Transport Critical Current Density ◽  
Ceramic Ybco

The present study was aimed at determining the rate of degradation of the transport critical current density Jc of ceramic YBCO stored in atmosphere, as a function of temperature. The transport critical current of ring-shaped samples was measured by the inductance technique. The samples were prepared by the standard method. The results show that annealing at 100 °C for over 500 h caused practically no degradation of Jc. Above 100 °C the rate of degradation increases rapidly with temperature.

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