Correlation of critical current density and phase conversion at different final cooling rate in Ag-sheathed PbBi2223 tapes

1999 ◽  
Vol 9 (2) ◽  
pp. 2746-2749 ◽  
Author(s):  
S.P. Feltham ◽  
L.N. Law ◽  
T.J. Hughes ◽  
Y. Yang ◽  
C. Beduz ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Cooling Rate ◽  
Critical Current ◽  
Current Density ◽  
Phase Conversion

Effect of Cooling Rate on Critical Current Density for Bi2Sr2CaCu2O8+δ/Ag Composite Tapes

1992 ◽  
Vol 31 (Part 2, No. 8B) ◽  
pp. L1167-L1169 ◽  
Author(s):  
Jun-ichi Shimoyama ◽  
Jun-ichiro Kase ◽  
Takeshi Morimoto ◽  
Hitoshi Kitaguchi ◽  
Hiroaki Kumakura ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Cooling Rate ◽  
Critical Current ◽  
Current Density

Effect of sintering temperature and cooling rate on microstructure, phase formation, and critical current density of Ag-sheathed Bi1.8Pb0.4Sr2Ca2Cu3Ox superconducting tapes

1998 ◽  
Vol 13 (2) ◽  
pp. 261-268 ◽  
Author(s):  
J. P. Singh ◽  
N. Vasanthamohan
Keyword(s):  
Critical Current Density ◽  
Cooling Rate ◽  
Critical Current ◽  
Current Density ◽  
Sintering Temperature ◽  
Superconducting Tapes ◽  
Temperature Quenching ◽  
Slow Cooling ◽  
Higher Temperature ◽  
Powder In Tube

Silver-sheathed Bi–Pb–Sr–Ca–Cu–O (2223) superconducting tapes (with a starting composition of Bi1.8Pb0.4Sr2Ca1Cu2O8, calcium cuprate, and CuO) were fabricated by the powder-in-tube technique. The tapes were sintered at various temperatures to optimize the formation of Bi1.8Pb0.4Sr2Ca2Cu3O10 phase within the tape. The results show that sintering within the temperature range of 815–825 °C can produce tapes with high critical current density (Jc). The Jc of samples sintered at the higher temperature of 825 °C, where more liquid is present, depended markedly on the rate at which tapes were cooled from the sintering temperature; samples sintered at lower temperatures did not exhibit such a cooling-rate effect. The optimum combination of phase purity and microstructure that yielded an average transport Jc of ≥ 2.5 × 104 A/cm2 was obtained when the tapes were sintered at 825 °C for 150 h and cooled at a rate of 25 °C/h from the sintering temperature. Quenching studies indicate that the Bi-2223 phase becomes unstable below 700 °C during slow cooling. This result may have important implications for processing Bi–Sr–Ca–Cu–O tapes with high Jc. Addition of 15 vol.% Ag flakes to the monolithic core exerted no significant effect on Jc.

The local phase conversion and critical current density of silver-doped (Bi/Pb)2Sr2Ca2Cu3Ox tapes

Cryogenics ◽  
1997 ◽  
Vol 37 (10) ◽  
pp. 605-608 ◽  
Author(s):  
Z. Yi ◽  
L. Law ◽  
C. Beduz ◽  
R.G. Scurlock ◽  
R. Riddle
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Local Phase ◽  
Phase Conversion

scholarly journals Enhancement of the 77 K irreversibility field and critical current density of (Bi,Pb)2Sr2Ca 2Cu3Ox tapes by manipulation of the final cooling rate

1996 ◽  
Vol 69 (19) ◽  
pp. 2915-2917 ◽  
Author(s):  
J. A. Parrell ◽  
D. C. Larbalestier ◽  
G. N. Riley ◽  
Q. Li ◽  
R. D. Parrella ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Cooling Rate ◽  
Critical Current ◽  
Current Density ◽  
Irreversibility Field

MAGNETIZATION MEASUREMENTS IN THE 80 K TRANSFORMATION FOR DEUTERATED ORGANIC SUPERCONDUCTOR κ-(BEDT-TTF)2Cu[N(CN)2]Br

2013 ◽  
Vol 27 (05) ◽  
pp. 1350037 ◽  
Author(s):  
H. EL OUADDI ◽  
A. TIRBIYINE ◽  
A. TAOUFIK ◽  
A. RAMZI ◽  
A. HAFID ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Cooling Rate ◽  
Critical Current ◽  
Current Density ◽  
Vortex Lattice ◽  
Magnetic Measurements ◽  
Strong Dependence ◽  
Magnetic Behavior ◽  
Organic Superconductor ◽  
Irreversible Magnetization

In this paper, we report systematic magnetic measurements on deuterated organic superconductor (κ- D 8- Br )κ-( BEDT - TTF )2 Cu [ N ( CN )2] Br . The irreversibility line H irr (T) and the critical current density Jc were studied. Our results show the strong dependence of H irr (T) and Jc on the cooling rate. The structural transformation which occurs at the vicinity of 80 K very strongly influences the physics of vortex lattice and the associated magnetic behavior. The irreversible magnetization becomes null at H irr and vortices are not pinned; therefore they can displace more freely for an increase of the field or the temperature.

INFLUENCE OF TECHNOLOGICAL PARAMETERS ON THE QUALITY OF THE Bi-BASED SUPERCONDUCTORS

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3729-3731 ◽  
Author(s):  
O. SMRČKOVÁ ◽  
D. SÝKOROVÁ ◽  
D. PETRÝDES ◽  
P. VAŠEK
Keyword(s):  
Critical Current Density ◽  
Cooling Rate ◽  
Critical Current ◽  
Current Density ◽  
Sintering Temperature ◽  
Undoped Sample ◽  
Critical Parameters ◽  
Nominal Composition ◽  
Technological Parameters

The effect of the sintering temperature, the cooling rate and the additive on the critical parameters was studied on samples with nominal composition Bi 1.8( Pb 0.26) Sr 2 Ca 2 Cu 3 O 8+x both undoped and with addition of 5, 9, 12.7 mol % of boron (as B 2 O 3), respectively. The sample with 5 mol % of boron cooled slowly had the critical current density five times higher than undoped sample. The rapid cooling of the samples caused enhancement of the volume of the 2223 phase.

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