scholarly journals Microscopic role of carbon on MgB2 wire for critical current density comparable to NbTi

2012 ◽  
Vol 4 (1) ◽  
pp. e3-e3 ◽  
Author(s):  
Jung Ho Kim ◽  
Sangjun Oh ◽  
Yoon-Uk Heo ◽  
Satoshi Hata ◽  
Hiroaki Kumakura ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Mgb2 Wire

Elucidating the role of dopants in the critical current density for dendrite formation in garnet electrolytes

2018 ◽  
Vol 6 (40) ◽  
pp. 19817-19827 ◽  
Author(s):  
Federico M. Pesci ◽  
Rowena H. Brugge ◽  
A. K. Ola Hekselman ◽  
Andrea Cavallaro ◽  
Richard J. Chater ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Crucial Role ◽  
Cubic Phase ◽  
Dendrite Formation

Dopants used to stabilise the cubic phase of LLZO also play a crucial role in the cell's critical current density.

Improvement of the critical current density and upper critical field in C-doped MgB2 wire using cellulose acetate

2010 ◽  
Vol 16 (6) ◽  
pp. 1029-1033 ◽  
Author(s):  
Soo Min Hwang ◽  
Chang Min Lee ◽  
Won Kim ◽  
Geun Chul Park ◽  
Jinho Joo ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Cellulose Acetate ◽  
Critical Current ◽  
Critical Field ◽  
Current Density ◽  
Upper Critical Field ◽  
Mgb2 Wire ◽  
Doped Mgb2

Enhancement in the Critical Current Density of C-Doped MgB2 Wire Using a Polyacrylic Acid Dopant

2012 ◽  
Vol 12 (2) ◽  
pp. 1406-1410
Author(s):  
Seung Muk Lee ◽  
Soo Min Hwang ◽  
Chang Min Lee ◽  
Won Kim ◽  
Jinho Joo ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Polyacrylic Acid ◽  
Mgb2 Wire ◽  
Doped Mgb2

Grain boundaries in high-Tc superconductors

1988 ◽  
Vol 46 ◽  
pp. 1008-1009
Author(s):  
M.F. Chisholm
Keyword(s):  
Critical Current Density ◽  
Grain Boundaries ◽  
Critical Current ◽  
Current Density ◽  
Weak Link ◽  
Critical Currents ◽  
Pinning Force ◽  
Conduction Path ◽  
Direct Measurements

One crucial property for most superconductor applications is the materials critical current density. Measurements on single crystals of YBa2Cu3O7, show critical currents to be in excess of 105 A/cm2 at 77K. However, polycrystalline samples show values of 103 A/cm2 or less at 77K. The critical current, unlike other superconductivity properties, is not a property of a specific composition but of a specific sample. Defects, introduced during the material processing, exert a pinning force which makes it possible for Type-II superconductors to carry current without losses. At the same time these defects represent an interruption in the structural and chemical order which has been shown to be necessary for superconductivity in the YBa2Cu3Ox phase, and so they may also act as a weak link in the conduction path. The most direct measurements of the role of individual grain boundaries on the critical current density are those of Chaudhari et al. who examined patterned YBa2Cu3O7 films grown on SrTiO3 substrates.

Role of Ag additions in the microstructural development, strain tolerance, and critical current density of Ag-sheathed BSCCO superconducting tapes

1993 ◽  
Vol 8 (10) ◽  
pp. 2458-2464 ◽  
Author(s):  
J.P. Singh ◽  
J. Joo ◽  
N. Vasanthamohan ◽  
R.B. Poeppel
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Microstructural Development ◽  
Composite Tape ◽  
Strain Tolerance ◽  
Before And After ◽  
Predetermined Level ◽  
Additional Improvement

Ag-sheathed tapes of Bi–Sr–Ca–Cu–O (BSCCO) and BSCCO–Ag superconducting cores were made by a powder-in-tube technique and subjected to repeated cycles of pressing and heat treatments. These thermomechanical treatments resulted in enhanced texturing and grain growth that improved the critical current density (Jc). Additions of Ag to the BSCCO core further increased texturing and brought an additional improvement in Jc. Strain tolerance of the tapes was evaluated by measuring Jc before and after application of a predetermined level of tensile strain in a uniaxial mode. The fraction of Jc retained after the strain application was higher in the BSCCO–Ag composite tapes than in the monolithic BSCCO. For a 1.2% applied strain, 90% of the initial Jc was retained in the BSCCO–Ag composite tape, compared to only 40% in the monolithic BSCCO tapes. The higher strain tolerance of the BSCCO–Ag tapes may be related to improved mechanical properties (strength, flexibility, and fracture toughness) and grain connectivity due to Ag addition.

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