scholarly journals Critical Current Density, Jc Improvement of BSCCO Superconductor Tapes with Nano Co3O4 Addition

2018 ◽  
Vol 395 ◽  
pp. 012007 ◽  
Author(s):  
A N Jannah ◽  
H Abdullah
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Bscco Superconductor ◽  
Critical Current Density Jc

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 ◽  
Powder In Tube

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 Pulsed Magnetic Field Processing on MgB2 Superconductors

2007 ◽  
Vol 546-549 ◽  
pp. 2063-2066 ◽  
Author(s):  
W.X. Li ◽  
Ying Li ◽  
M.Y. Zhu ◽  
R.H. Chen ◽  
H.M. Jin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Pulsed Magnetic Field ◽  
Pinning Force ◽  
Critical Current Density Jc ◽  
Mgb2 Superconductors ◽  
Doped Mgb2 ◽  
Flux Pinning Force

Pulsed magnetic field was first employed in the study on MgB2 superconductors. Superconductivity properties and microstructures of Zn and SiC doped MgB2 were discussed in this paper. The superconductors showed different superconductivities after magnetic sintering. Critical current density and flux pinning force were relevant to the dopants properties in MgB2. Grains in the pulsed magnetic processed MgB2 matrix were smaller than those in the normal processed one. The refinement microstructures have caused the critical current density (Jc) anisotropy in both the Zn and SiC doped MgB2.

Structure of superconducting fibers prepared by laser-heated pedestal growth method

1990 ◽  
Vol 48 (4) ◽  
pp. 30-31
Author(s):  
L.Y. Cai ◽  
Y.J. Huo ◽  
S.N. Mao ◽  
M.L. Liu ◽  
F.H. Li
Keyword(s):  
Critical Current Density ◽  
Laser Beam ◽  
Critical Current ◽  
Transition Region ◽  
Current Density ◽  
Raw Material ◽  
Molten Zone ◽  
Growth Method ◽  
Laser Heated ◽  
Critical Current Density Jc

Superconducting fibers have drawn great attention because of the latent prospect for applications. Fibers of superior quality were obtained by means of the laser-heated pedestal growth (LHPG) method. For LHPG method a fine laser beam is focused at the “source rod” made of raw material so that a small molten zone is formed on its upper end. Then a seed crystal is introduced into the melt and drawn from it to grow crystalline fibers. In this paper the structure of bismuth based Bi-Sr-Ca-Cu-O and Bi-Pb-Sr-Ca-Cu-O superconducting fibers prepared by LHPG is reported. The values of Tc for the two kinds of fibers are 85k and 108k respectively. The critical current density Jc can reach 5150A/cm2. The diameters of fibers are ranged from 35μm-200μm. The thin fibers are flexible.Fig.1 shows the transition region between the source rod (R) and the LHPG fiber (G). It indicates that the source crystal first melts and then recrystallizes along a certain cry stenographic direction.

The critical current density Jc(T,H) of high-Tcsuperconducting oxides

1989 ◽  
Vol 2 (1) ◽  
pp. 59-62 ◽  
Author(s):  
Cui Chang-Geng ◽  
Li Shan-Lin ◽  
Zhang Jin-Long ◽  
Wang Hui-Sheng ◽  
Li Lin ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Critical Current Density Jc

Critical Current Density and Pinning Energy of Partial Melted Sm-Based Superconductor

2014 ◽  
Vol 95 ◽  
pp. 169-174
Author(s):  
Hiroya Imao
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Melting Process ◽  
Pinning Force ◽  
Pinning Energy ◽  
Partial Melting Process ◽  
Pinning Center ◽  
The Relationship ◽  
Critical Current Density Jc

The relationship between critical current density (Jc) and pinning energy (Up) in partial melted superconductors was investigated. The partial melted Sm-Ba-Cu-O superconducting bulks were composed of SmBa2Cu3Ox (Sm-123) superconductor and Sm2BaCuOy (Sm-211) insulator. The pinning force and the pinning energy of the superconductor were measured by a system combining an electronic balance and permanent magnet. The pinning energy and the Jc of the samples were influenced by crystalline orientation. The Jc of the samples depends on the pinning energy. However, in the partial melting process, changes in retention temperature altered the Jc values but had little effect on the value of the pinning energy. The results indicated that Jc was influenced by the dispersion of the insulator acting as a pinning center with in the superconducting bulks.

scholarly journals The use of the in-field critical current density, Jc(0.1 T), as a better descriptor of (Bi, Pb)2Sr2Ca2Cu3Ox/Ag tape performance

1999 ◽  
Vol 75 (20) ◽  
pp. 3168-3170 ◽  
Author(s):  
L. A. Schwartzkopf ◽  
J. Jiang ◽  
X. Y. Cai ◽  
D. Apodaca ◽  
D. C. Larbalestier
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Critical Current Density Jc

High Critical Current Density in Ultrathin Ybco Films

1989 ◽  
Vol 169 ◽  
Author(s):  
X.X. Xi ◽  
W. Schauer ◽  
V. Windte ◽  
O. Meyer ◽  
G. Linker ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Thick Film ◽  
Critical Current ◽  
Field Dependence ◽  
Current Density ◽  
Weak Field ◽  
Zero Field ◽  
High Critical Current Density ◽  
Ybco Films ◽  
Critical Current Density Jc

AbstractMeasurements of the critical current density Jc for ultrathin YBa2Cu307‐X (YBCO) films are presented.A high Jc value at 77K in zero field of 2xl06A/cm2 was obtained in a 30nm thick film and even a 5nm thick film could carry a supercurrent of 3.5x105 A/cm2 at 4.2K in zero field. A very weak field‐dependence of Jc was observed when the field was in the (a,b) plane showing greatly depressed dissipation.

scholarly journals Effect of Magnetic Field on Critical Current Density in Bulk Superconducting Wires

1989 ◽  
Vol 169 ◽  
Author(s):  
M. T. Lanagan ◽  
U. Balachandran ◽  
C. A. Youngdahl ◽  
J. T. Dusek ◽  
J. J. Picciolo ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Weak Link ◽  
Copper Wire ◽  
Superconducting Wires ◽  
Critical Current Density Jc ◽  
The Magnetic Field ◽  
A Current

AbstractBulk YBa2Cu3O7‐x (YBCO) wires and tubes were fabricated by an extrusion technique. Critical current density (Jc) was measured as a function of applied magnetic field at 77 K and was found to decrease significantly in fields below 100 G. Jc was dependent on specimen geometry. In addition, when a concentric magnetic field was generated by passing a current though a copper wire, the external field from the wire could interfere constructively or destructively with the magnetic field produced by current in a YBCO tube. The change in electrical properties with magnetic field has been attributed to weak‐link behavior at the grain boundaries. Batch‐to‐batch differences in the field dependence of Jc imply the possibility of reducing the dependence by processing modifications.

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