Flux pinning enhancement in Ag-clad Bi-2212 wires by reactive doping with barium peroxide

1999 ◽  
Vol 9 (2) ◽  
pp. 1828-1831 ◽  
Author(s):  
U.P. Trociewitz ◽  
P.V.P.S.S. Sastry ◽  
P.R. Sahm ◽  
J. Schwartz
Keyword(s):  
Flux Pinning ◽  
Barium Peroxide

Interfacial studies in Nb3Sn superconductors

1991 ◽  
Vol 49 ◽  
pp. 590-591
Author(s):  
Ernest L. Hall ◽  
Lee E. Rumaner ◽  
Mark G. Benz
Keyword(s):  
Grain Size ◽  
Grain Boundaries ◽  
Flux Pinning ◽  
Size Control ◽  
High Magnetic Fields ◽  
Type Ii ◽  
Reaction Interface ◽  
Liquid Diffusion ◽  
Type Ii Superconductor ◽  
Grain Size Control

The intermetallic compound Nb3Sn is a type-II superconductor of interest because it has high values of critical current density Jc in high magnetic fields. One method of forming this compound involves diffusion of Sn into Nb foil containing small amounts of Zr and O. In order to maintain high values of Jc, it is important to keep the grain size in the Nb3Sn as small as possible, since the grain boundaries act as flux-pinning sites. It has been known for many years that Zr and O were essential to grain size control in this process. In previous work, we have shown that (a) the Sn is transported to the Nb3Sn/Nb interface by liquid diffusion along grain boundaries; (b) the Zr and O form small ZrO2 particles in the Nb3Sn grains; and (c) many very small Nb3Sn grains nucleate from a single Nb grain at the reaction interface. In this paper we report the results of detailed studies of the Nb3Sn/Nb3Sn, Nb3Sn/Nb, and Nb3Sn/ZrO2 interfaces.

The stability of dislocation networks under various oxygen-doping conditions in superconducting Bi2Sr2CaCu2Oy single crystals and their influence on the flux pinning properties

1994 ◽  
Vol 52 ◽  
pp. 802-803
Author(s):  
Y. Feng ◽  
X. Y. Cai ◽  
R. J. Kelley ◽  
D. C. Larbalestier
Keyword(s):  
Single Crystals ◽  
Oxygen Content ◽  
Basal Plane ◽  
Flux Pinning ◽  
Pinning Centers ◽  
Before And After ◽  
Anomalous Peak ◽  
Basal Plane Dislocation ◽  
The Stability ◽  
Further Development

The issue of strong flux pinning is crucial to the further development of high critical current density Bi-Sr-Ca-Cu-O (BSCCO) superconductors in conductor-like applications, yet the pinning mechanisms are still much debated. Anomalous peaks in the M-H (magnetization vs. magnetic field) loops are commonly observed in Bi2Sr2CaCu2Oy (Bi-2212) single crystals. Oxygen vacancies may be effective flux pinning centers in BSCCO, as has been found in YBCO. However, it has also been proposed that basal-plane dislocation networks also act as effective pinning centers. Yang et al. proposed that the characteristic scale of the basal-plane dislocation networksmay strongly depend on oxygen content and the anomalous peak in the M-H loop at ˜20-30K may be due tothe flux pinning of decoupled two-dimensional pancake vortices by the dislocation networks. In light of this, we have performed an insitu observation on the dislocation networks precisely at the same region before and after annealing in air, vacuumand oxygen, in order to verify whether the dislocation networks change with varying oxygen content Inall cases, we have not found any noticeable changes in dislocation structure, regardless of the drastic changes in Tc and the anomalous magnetization. Therefore, it does not appear that the anomalous peak in the M-H loops is controlled by the basal-plane dislocation networks.

Raising flux pinning by Ni substitution in YBa2Cu3O7-δ

2018 ◽  
Vol 18 (3) ◽  
pp. 421-425
Author(s):  
B Hadisichani ◽  
H Shakeripour ◽  
H Salamati ◽  
◽  
◽  
...  
Keyword(s):  
Flux Pinning ◽  
Ni Substitution

Summation of Flux Pinning by Columnar Defects Tilted at Different Angles in YBCO Thin Films

2021 ◽  
Vol 31 (5) ◽  
pp. 1-5
Author(s):  
Tetsuro Sueyoshi ◽  
Ryusei Enokihata ◽  
Hiroshi Yamaguchi ◽  
Takanori Fujiyoshi ◽  
Yasuki Okuno ◽  
...  
Keyword(s):  
Thin Films ◽  
Flux Pinning ◽  
Ybco Thin Films ◽  
Columnar Defects

Effect of Nano-Size Magnetic Additions on Low Temperature Flux Pinning of Y-Ba-Cu-O Thin Films

2021 ◽  
Vol 31 (5) ◽  
pp. 1-7
Author(s):  
Mary Ann Sebastian ◽  
Neal A. Pierce ◽  
Iman Maartense ◽  
Gregory Kozlowski ◽  
Timothy J. Haugan
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Flux Pinning ◽  
Nano Size

Catalytic and inhibiting effects of barium peroxide and hydroxide on the decomposition of sodium chlorate

1995 ◽  
Vol 261 ◽  
pp. 119-124 ◽  
Author(s):  
Yunchang Zhang ◽  
Girish Kshirsagar ◽  
John E. Ellison ◽  
James C. Cannon
Keyword(s):  
Sodium Chlorate ◽  
Barium Peroxide

Flux-pinning potential and doping effect in (Bi,Pb)2Sr2Ca2Cu3Oy

1991 ◽  
Vol 185-189 ◽  
pp. 2355-2356 ◽  
Author(s):  
Ryozo Yoshizaki ◽  
Hiroshi Ikeda ◽  
Masaya Watahiki ◽  
Kozo Yoshikawa ◽  
Nobuyoshi Tomita
Keyword(s):  
Flux Pinning ◽  
Doping Effect ◽  
Pinning Potential
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