scholarly journals Microstructure and superconducting properties of Bi-2223/Ag tapes fabricated in the variation-temperature-sintering process

2012 ◽  
Vol 27 ◽  
pp. 260-263 ◽  
Author(s):  
X.Y. Lu ◽  
D. Yi ◽  
H. Chen ◽  
A. Nagata
Keyword(s):  
Sintering Process ◽  
Superconducting Properties

Microstructure and superconducting properties of Bi-2223/Ag tapes fabricated in the pressing–melting–sintering process

2010 ◽  
Vol 470 (20) ◽  
pp. 1388-1391 ◽  
Author(s):  
X.Y. Lu ◽  
D. Yi ◽  
H. Chen ◽  
A. Nagata ◽  
K. Sugawara
Keyword(s):  
Sintering Process ◽  
Superconducting Properties

Sintering of Textured YBa2Cu307-x Under Intensive 60Co Gamma Irradiation

1994 ◽  
Vol 354 ◽  
Author(s):  
Elvira M. Ibragimova ◽  
Eldar M. Gasanov ◽  
Makhmud Kalanov ◽  
Marquis A. Kirk ◽  
Ken C. Goretta
Keyword(s):  
Gamma Irradiation ◽  
Dose Rate ◽  
Subsurface Layer ◽  
Gamma Dose ◽  
Ordered Structure ◽  
Sintering Process ◽  
Superconducting Properties ◽  
Oxygen Sublattice ◽  
60Co Gamma ◽  
Sem Analyses

AbstractA study of structural and superconducting characteristics of YBa2Cu307-x ceramics sintered after and in the course of gamma-irradiation is reported. Using X-difraction and SEM analyses and transport measurements, it has been shown that mainly the subsurface layer of crystallites and intergrain contacts are affected by the irradiation by means of sorption/desorption of oxygen and ordering/disordering in oxygen sublattice, which depends on gamma dose rate and dose. The irradiation provides the sintering process with an additional superthermal energy to form the orthorhombic well-ordered structure and to obtain dense ceramics possessing strong intergrain contacts and improved and stable superconducting properties

Effect of MgO content on the formation and superconducting properties of (Bi,Pb)-2223 phase in the partial-melting and sintering process

2001 ◽  
Vol 357-360 ◽  
pp. 828-831 ◽  
Author(s):  
X.Y. Lu ◽  
A. Nagata ◽  
D. Kamio ◽  
K. Sugawara ◽  
S. Kamada ◽  
...  
Keyword(s):  
Partial Melting ◽  
Sintering Process ◽  
Superconducting Properties

Dielectric properties of (SWCNTs)x GdBa2CuO7−δ superconductor nanocomposites

2017 ◽  
Vol 31 (31) ◽  
pp. 1750290 ◽  
Author(s):  
M. Anas ◽  
S. Ebrahim ◽  
I. G. Eldeen ◽  
R. Awad ◽  
A. I. Abou-Aly
Keyword(s):  
Dielectric Properties ◽  
Phase Formation ◽  
Dielectric Response ◽  
Single Walled Carbon Nanotubes ◽  
Superconducting Phase ◽  
Sintering Process ◽  
Superconducting Properties ◽  
Solid State Reaction Technique ◽  
Micro Cracks ◽  
Walled Carbon Nanotubes

Gd-123 superconducting phase was prepared by solid-state reaction technique. Single-walled carbon nanotubes (SWCNTs) were added in Gd-123 superconducting matrix with different concentrations during the final sintering process to obtain (SWCNTs)[Formula: see text] GdBa2Cu3O[Formula: see text] (x = 0.0–0.1 wt.%) nanoparticles–superconductor composite. The influence of SWCNTs addition on the phase formation, structural, morphological, superconducting and dielectric properties of Gd-123 phase was investigated. It was found that SWCNTs addition enhance the phase formation and does not change the crystal structure of the host Gd-123 superconducting phase. The superconducting properties of Gd-123 samples were improved after the addition of SWCNTs up to x = 0.06 wt.% due to the enhancement in intergrain connectivity by healing up of micro-cracks and reduction of defects, while these properties were retarded with further increase in x. The dielectric response of (SWCNTs)[Formula: see text] Gd-123 superconducting phase with x = 0.0, 0.01, 0.04, 0.05, 0.06 and 0.1 wt.% was measured from 100 KHz to 5 MHz at 77 K. The results reveal that for both real ([Formula: see text]) and imaginary ([Formula: see text]) parts of dielectric constant, the frequency of dispersion increased by increasing SWCNTs amount up to 0.06 wt.%, then this frequency shifted to lower values for x [Formula: see text] 0.06 wt.%. The results were discussed according to the presence and interference of both interfacial and dipolar polarizations.

Effects of morphology of Mg powder precursor on phase formation and superconducting properties of Mg11B2 low activation superconductor

2018 ◽  
Vol 6 (30) ◽  
pp. 8069-8075 ◽  
Author(s):  
Feng Cheng ◽  
Zongqing Ma ◽  
Liming Yu ◽  
Chong Li ◽  
Chenxi Liu ◽  
...  
Keyword(s):  
Phase Formation ◽  
Sintering Process ◽  
Superconducting Properties ◽  
Powder Precursor

The sintering process of Mg11B2 sample using spherical Mg powder is different from the plate-like one (usual used).

Effect of Thermal Processing on the Microstructures and Superconducting Properties of YBa2Cu3Oy

1987 ◽  
Vol 99 ◽  
Author(s):  
K. Gotoh ◽  
H. Enomoto ◽  
K. Iida ◽  
Y. Takano ◽  
N. Mori ◽  
...  
Keyword(s):  
Grain Size ◽  
Electrical Properties ◽  
Low Temperature ◽  
Sample Preparation ◽  
Thermal Processing ◽  
Superconducting Phase ◽  
Sintering Process ◽  
Superconducting Properties ◽  
Cooling Process ◽  
High Tc

ABSTRACTThe effect of thermal processing in the sample preparation of YBa2Cu3Oy has been investigated systematically on microstructures and electrical properties. The grain size was found to grow preferably during the cooling process rather than during the sintering process. The high Tc superconducting phase appears around 500 C in this thermal processing. The annealing experiment shows that the grains still grow at low temperature such as 300 °C.

Characterization of Y-Ba-Cu-O films grown on silicon substrates by sequential evaporation

1988 ◽  
Vol 46 ◽  
pp. 866-867
Author(s):  
E. L. Hall ◽  
A. Mogro-Campero ◽  
L. G. Turner ◽  
N. Lewis
Keyword(s):  
Thin Film ◽  
Thin Film Deposition ◽  
Superconducting Films ◽  
Electron Beam Evaporation ◽  
Film Deposition ◽  
Silicon Substrates ◽  
Superconducting Properties ◽  
Sequential Electron ◽  
Thin Superconducting Films

There is great interest in the growth of thin superconducting films of YBa2Cu3Ox on silicon, since this is a necessary first step in the use of this superconductor in a variety of possible electronic applications including interconnects and hybrid semiconductor/superconductor devices. However, initial experiments in this area showed that drastic interdiffusion of Si into the superconductor occurred during annealing if the Y-Ba-Cu-O was deposited direcdy on Si or SiO2, and this interdiffusion destroyed the superconducting properties. This paper describes the results of the use of a zirconia buffer layer as a diffusion barrier in the growth of thin YBa2Cu3Ox films on Si. A more complete description of the growth and characterization of these films will be published elsewhere.Thin film deposition was carried out by sequential electron beam evaporation in vacuum onto clean or oxidized single crystal Si wafers. The first layer evaporated was 0.4 μm of zirconia.

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