Thermally activated flux movement and critical transport current density in epitaxialBi2Sr2CaCu2O8+δfilms

1994 ◽  
Vol 49 (18) ◽  
pp. 13184-13192 ◽  
Author(s):  
P. Wagner ◽  
F. Hillmer ◽  
U. Frey ◽  
H. Adrian
Keyword(s):  
Current Density ◽  
Transport Current ◽  
Thermally Activated ◽  
Activated Flux ◽  
Transport Current Density

scholarly journals Influence of Preparation Process on Microstructure, Critical Current Density and Tc of MgB2/Fe/Cu Wires

2007 ◽  
Vol 546-549 ◽  
pp. 2031-2034
Author(s):  
Y.F. Wu ◽  
G. Yan ◽  
J.S. Li ◽  
Y. Feng ◽  
Shao Kai Chen ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Current Density ◽  
Rolling Process ◽  
High Energy ◽  
Transport Current ◽  
Post Heat Treatment ◽  
Mechanically Alloyed ◽  
Mgb2 Wires ◽  
Powder In Tube ◽  
Transport Current Density

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.

Influence of twinning and grain structure on the critical transport current density of YBa2Cu3O7-δ

Cryogenics ◽  
1988 ◽  
Vol 28 (10) ◽  
pp. 671-673 ◽  
Author(s):  
S. Iwama ◽  
P.J. King ◽  
D.S. Misra ◽  
W.B. Roys ◽  
D.N. Matthews ◽  
...  
Keyword(s):  
Current Density ◽  
Transport Current ◽  
Grain Structure ◽  
Transport Current Density
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