Magnetization studies of the influence of fast neutron irradiation on critical current density of melt‐textured YBa2Cu3O7−x

1992 ◽  
Vol 61 (17) ◽  
pp. 2102-2104 ◽  
Author(s):  
R. Puźniak ◽  
A. Wiśniewski ◽  
H. Szymczak ◽  
Jingrong Wang ◽  
Pingxiang Zhang ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Fast Neutron ◽  
Critical Current ◽  
Neutron Irradiation ◽  
Current Density ◽  
Fast Neutron Irradiation

Critical Current Enhancement in Single-Crystal Ba2Ycu3O7

1989 ◽  
Vol 169 ◽  
Author(s):  
R. B. van Dover ◽  
E. M. Gyorgy ◽  
L. F. Schneemeyer ◽  
A. E. White ◽  
S. Glarum ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Single Crystal ◽  
Fast Neutron ◽  
Single Crystals ◽  
Critical Current ◽  
Neutron Irradiation ◽  
Current Density ◽  
Proton Irradiation ◽  
Significant Enhancement ◽  
Fast Neutron Irradiation

AbstractThe critical current density, Jc, of single crystals of Ba2YCu3O7 is comparable to that of melt-textured-growth materials as well as to the intragrain Jc of bulk polycrystalline Ba2YCu3O7. Typical values at 77 K and 9 kOe are near 5x 103 A/cm2, and are presumably limited by weak pinning. We have obtained a significant enhancement of this pinning-limited Jc by three techniques: 1) a short reannealing procedure, 2) fast neutron irradiation, and 3) proton irradiation. Interestingly, the combination of the first technique followed by either irradiation is not as effective as the iradiation alone. That is, the best candidates for irradiation are not necessarily those with the highest initial Jc.

Effect of Fast Neutron Irradiation on Critical Current Density of Nb-Ti Alloy for Fusion Reactor

1974 ◽  
Vol 11 (2) ◽  
pp. 77-79
Author(s):  
Hiroshi TSUBAKIHARA ◽  
Touichi OKADA ◽  
Tokuo SUITA ◽  
Takefumi HORIUCHI ◽  
Kiyoshi MATSUMOTO ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Fast Neutron ◽  
Critical Current ◽  
Neutron Irradiation ◽  
Current Density ◽  
Fusion Reactor ◽  
Ti Alloy ◽  
Fast Neutron Irradiation

Radiation Damage in YBa2Cu3O7 by Fast Neutrons

1987 ◽  
Vol 99 ◽  
Author(s):  
J. O. Willis ◽  
J. R. Cost ◽  
R. D. Brown ◽  
J. D. Thompson ◽  
D. E. Peterson
Keyword(s):  
Transition Temperature ◽  
Critical Current Density ◽  
Fast Neutron ◽  
Critical Current ◽  
Current Density ◽  
Superconducting Transition Temperature ◽  
Fast Neutrons ◽  
Zero Field ◽  
Superconducting Transition ◽  
Fast Neutron Irradiation

ABSTRACTThe superconducting transition temperature of sintered YBa2Cu3O7 decreases at a rate of 2.7 K/1018 n/cm2 (E > 0.1 MeV) for fast neutron irradiation. The critical current density Jc increases a factor of three at zero field and more than three at nonzero fields for fluences up to 2×1018 n/cm2. At both 7 and 75 K, Jc is decreasing with fluence near 3×1018 n/cm2.

Irradiation Defect Structures In YBa2Cu3O7-xand their Correlation with Superconducting Properties

1990 ◽  
Vol 209 ◽  
Author(s):  
Marquis A. Kirk
Keyword(s):  
Critical Temperature ◽  
Critical Current Density ◽  
Critical Current ◽  
Neutron Irradiation ◽  
Current Density ◽  
Amorphous Material ◽  
Amorphous Structure ◽  
Fast Neutrons ◽  
High Fluences ◽  
Defect Microstructures

ABSTRACTWe review our work on irradiation effects in single crystal YBa2Cu3O7-x. Transmission electron microscopy has been employed to study the defect microstructures produced by irradiations with fast neutrons, MeV ions (Kr, Ne and p), and electrons. The atomic structure within defect cascades was investigated using 50 keV Kr and Xe ion irradiations to low doses. Evidence is shown for an amorphous structure with some incoherent recrystallization within individual cascades. Correlation with enhancements in critical current density produced by neutron irradiations suggest that this cascade structure effectively pins magnetic flux lines.At sufficiently high fluences of fast neutrons or MeV Kr and Ne ions, a cellular microstructure is found. This structure consists of cells or microcrystallites of good crystalline and superconducting material (in the case of neutron irradiation), with cell walls of amorphous material. Full amorphization proceeds with the growth of cell wall volume. The formation of this microstructure coincides with a decrease in critical transport current, but is not observed by magnetization measurements.Increases in critical current density under proton irradiation, comparable to those produced by neutron irradiation, have been reported. The defect structure produced by proton irradiations is examined here and found to differ from that of neutron irradiations. The structure is suggested to be consistent with the clustering of mobile defects (at 300 K) produced by the lower energy recoils which dominate in proton irradiations. In both the proton and fast neutron irradiations, to fluences producing the maximum enhancements in critical current densities, the degradations in critical temperature are not severe, <10 K.Our most recent measurements of changes in critical temperature and current density, and defect microstructure following electron irradiations will be described

Enhancement of transport critical current densities in (Bi,Pb)2Sr2Ca2Cu3O10/Ag tapes at 77 K following fast neutron irradiation

1994 ◽  
Vol 65 (23) ◽  
pp. 3008-3010 ◽  
Author(s):  
Q. Y. Hu ◽  
H. W. Weber ◽  
F. M. Sauerzopf ◽  
G. W. Schulz ◽  
R. M. Schalk ◽  
...  
Keyword(s):  
Fast Neutron ◽  
Critical Current ◽  
Neutron Irradiation ◽  
Fast Neutron Irradiation ◽  
Current Densities
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