scholarly journals Improvement of superconducting parameters of Bi1.6Pb0.4Sr 2Ca 2Cu 3O10+ δ added with Au nanoparticles

2018 ◽  
Vol 16 (38) ◽  
Author(s):  
Amal K. Jassim
Keyword(s):  
Electrical Resistivity ◽  
Magnetic Susceptibility ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Au Nanoparticles ◽  
Ac Magnetic Susceptibility ◽  
Critical Temperatures ◽  
Magnetization Measurements ◽  
Dc Electrical Resistivity

Samples of Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconductor were prepared by solid-state reaction method to study the effects of gold nanoparticles addition to the superconducting system, Nano-Au was introduced by small weight percentages (0.25, 0.50, 0.75, 1.0, and 1.25 weight %). Phase identification and microstructuralcharacterization of the samples were investigated using XRD and SEM. Moreover, DC electrical resistivity as a function of the temperature, critical current density Jc, AC magnetic susceptibility, and DC magnetization measurements were carried to evaluate the relative performance of samples. x-ray diffraction analysis showed that both (Bi,Pb)-2223 and Bi-2212 phases coexist in the samples having an orthorhombic crystal structure. Both the onset critical temperatures Tc (onset) and zero electrical resistivity critical temperatures Tc (R=0) of the samples were determined from the DC electrical resistivity measurements. An improvement of the superconducting transition temperature of 6.36 % was obtained with increasing Au nanoparticles to x = 1.25 wt.%, while the critical current density is improved by 220 %. AC magnetic susceptibility measurement showed that the diamagnetic fraction and intergranular coupling of the x = 1.25 wt.% sample are greater than those of the others. The variation of magnetization with temperature (M-T curve) of the samples was measured by cooling the sample in zero fields (ZFC) and an applied field of 10 Oe (FC). The results of AC magnetic susceptibility and DC magnetization measurements were in good agreement with DC electrical resistivity measurement.

MAGNETIZATION AND INTRAGRANULAR CRITICAL CURRENT DENSITY IN Yb1Ba2Cu3O7−x HIGH TEMPERATURE SUPERCONDUCTOR

1995 ◽  
Vol 09 (28) ◽  
pp. 3715-3723
Author(s):  
RAANA MAHMOOD ◽  
M. NASIR KHAN ◽  
M. S. ZAFAR ◽  
FARID A. KHWAJA ◽  
A. WAHEED
Keyword(s):  
Electrical Resistivity ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Applied Field ◽  
High Temperature Superconductor ◽  
Orthorhombic Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Current Densities

The Yb 1 Ba 2 Cu 3 O 7−x samples have been prepared by the solid state reaction using the appropriate amount of Yb 2 O 3, BaCO 3, and CuO powders and characterized them using X-ray diffraction and electrical resistivity techniques. The X-ray diffraction pattern of the sample shows an orthorhombic structure refined in the space group Pmmm. The critical current densities are calculated from magnetization measurements over a temperature range 77 K to 86 K, and in magnetic fields up to 2 KOe. The intragrain critical current density is estimated to range from 5.24 × 106 ( A/cm 2) at an applied field of 0.2 KOe to 1.01 × 106 ( A/cm 2) at an applied field of 2 KOe at T = 77 K in this sample.

Noncontact estimation of critical current density and magnetic susceptibility in a ring-shaped high Tc superconductor

1991 ◽  
Vol 185-189 ◽  
pp. 2315-2316
Author(s):  
Y. Sakamoto ◽  
Y. Masuda ◽  
Y. Yokochi ◽  
T. Muranaka ◽  
S. Fujita ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Tc ◽  
High Tc Superconductor

Evaluation of the Critical Current Density of Multifilamentary ${\rm Nb}_{3}{\rm Sn}$ Wires From Magnetization Measurements

2012 ◽  
Vol 22 (3) ◽  
pp. 6000604-6000604 ◽  
Author(s):  
T. Baumgartner ◽  
M. Eisterer ◽  
H. W. Weber ◽  
R. Flükiger ◽  
B. Bordini ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Magnetization Measurements

DC TRANSPORT PROPERTIES IN GdSr2RuCu2Oy COMPOUND

2003 ◽  
Vol 17 (04n06) ◽  
pp. 893-898
Author(s):  
A. NIGRO ◽  
B. SAVO ◽  
A. VECCHIONE ◽  
M. GOMBOS ◽  
C. NOCE ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Critical Current Density ◽  
Temperature Dependence ◽  
Transport Properties ◽  
Critical Current ◽  
Current Density ◽  
Superconducting State ◽  
Arrhenius Plots ◽  
Thermally Activated ◽  
Dissipation Mechanism

Dc transport properties of sintered samples of GdSr 2 RuCu 2 O y have been investigated in the superconducting state, at temperature ranging between 4.2K and 40K. To understand the origin of dissipation mechanism in these materials, the temperature dependence of the electrical resistivity has been analyzed at different bias currents. A thermally activated behavior has been clearly found in the Arrhenius plots of the data. The normalized critical current density as a function of the temperature has been also reported.

Properties of Ag Doped Bi-Superconductors Prepared by Solid State and Sol-Gel Methods

2006 ◽  
Vol 47 ◽  
pp. 104-107
Author(s):  
Dagmar Sýkorová ◽  
Olga Smrčková ◽  
Petr Vašek
Keyword(s):  
Solid State ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
In Situ Polymerization ◽  
Sol Gel ◽  
Nominal Composition ◽  
Critical Temperatures ◽  
Current Voltage ◽  
Lower Porosity

Superconductive ceramics with nominal composition Bi3.2Pb0.8Sr4Ca5Cu7Ox were prepared by solid state synthesis with 10 wt% of nanopowdered silver and were compared with those prepared by sol-gel method. The "in situ" polymerization route with citric acid and ethylene glycol was used to enhance homogeneity of the reaction mixture. The quality of samples was characterized by X-ray analysis, scanning electronic microscopy and the measurement of porosity. The superconducting properties were investigated by the measurement of the temperature dependence of magnetic susceptibility and by current voltage characteristic. All samples have critical temperatures in the range from 109 to112 K. Addition of silver always increases the volume of Bi-2223 phase and critical current density of the samples. Sol-gel samples reveal lower porosity, higher bulk density and better connectivity of the grains, resulting in the further enhancement of critical current density.

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