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

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

scholarly journals Cooperative doping effects of Ti and C on critical current density and irreversibility field of MgB2

2006 ◽  
Vol 100 (12) ◽  
pp. 123902 ◽  
Author(s):  
Y. Zhao ◽  
Y. Feng ◽  
T. M. Shen ◽  
G. Li ◽  
Y. Yang ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Irreversibility Field ◽  
Doping Effects

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.

scholarly journals High critical current density and improved irreversibility field in bulk MgB2 made by a scaleable, nanoparticle addition route

2002 ◽  
Vol 81 (11) ◽  
pp. 2026-2028 ◽  
Author(s):  
J. Wang ◽  
Y. Bugoslavsky ◽  
A. Berenov ◽  
L. Cowey ◽  
A. D. Caplin ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Irreversibility Field ◽  
High Critical Current Density ◽  
Bulk Mgb2

Enhancement of the critical current density and the irreversibility field in maleic anhydride doped MgB2 based tapes

2007 ◽  
Vol 102 (1) ◽  
pp. 013914 ◽  
Author(s):  
Zhaoshun Gao ◽  
Yanwei Ma ◽  
Xianping Zhang ◽  
Dongliang Wang ◽  
Zhengguang Yu ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Irreversibility Field ◽  
Doped Mgb2
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