Superior high-field current density in slightly Mg-deficient MgB2 tapes

2005 ◽  
Vol 87 (25) ◽  
pp. 252505 ◽  
Author(s):  
C. H. Jiang ◽  
T. Nakane ◽  
H. Kumakura
Keyword(s):  
Current Density ◽  
High Field

Formation of Barrier Oxide Film on Lead in Borate Solutions

1994 ◽  
Vol 59 (6) ◽  
pp. 1305-1310 ◽  
Author(s):  
Emad E. Abdel Aal ◽  
Mohamed M. Hefny
Keyword(s):  
Oxide Film ◽  
Current Density ◽  
High Field ◽  
Empirical Relation ◽  
Field Approximation ◽  
Ion Concentration ◽  
Solution Temperature ◽  
Oxide Growth ◽  
Rate Of Growth ◽  
Barrier Type

Galvanostatic anodization of lead in borate solutions reveals that lead can form a barrier type oxide film. The rate of growth, R, fulfils the empirical relation, R = aib within the current density i range from 1.16 .10-4 to 3.19 .10-4 A cm-2. The magnitudes of the parameters a and b are 6.9 . 103 and 1.6, respectively, it has been found that the high field approximation is applicable for the oxide growth on lead. The coefficients of the dependence of R on solution temperature, T, pH and borate ion concentration, c, viz. (∂R/∂T), (∂R/∂pH) and (∂R/∂log c) are -18 . 10-4, -0.13 and 0.41, respectively.

Enhancement of flux pinning and high-field critical current density in carbon-alloyedMgB2thin films

2006 ◽  
Vol 74 (17) ◽  
Author(s):  
J. Chen ◽  
V. Ferrando ◽  
P. Orgiani ◽  
A. V. Pogrebnyakov ◽  
R. H. T. Wilke ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Flux Pinning ◽  
High Field

High-field magnetisation and the critical current density in superconducting BiSrCaCu2Ox

1988 ◽  
Vol 18 (6) ◽  
pp. L123-L125 ◽  
Author(s):  
P A J de Groot ◽  
P C Lanchester ◽  
M T Weller ◽  
J R Grasmeder ◽  
G P Rapson ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Field
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