scholarly journals Correction: Weak-link-free behaviour of high-angle YBa2Cu3O7–δ grain boundaries in high magnetic fields

Nature ◽  
1991 ◽  
Vol 349 (6306) ◽  
pp. 264-264 ◽  
Author(s):  
S. E. Babcock ◽  
X. Y. Cai ◽  
D. L. Kaiser ◽  
D. C. Larbalestier
Keyword(s):  
Magnetic Fields ◽  
Grain Boundaries ◽  
Weak Link ◽  
High Magnetic Fields ◽  
High Angle

Weak-link-free behaviour of high-angle YBa2Cu3O7–δ grain boundaries in high magnetic fields

Nature ◽  
1990 ◽  
Vol 347 (6289) ◽  
pp. 167-169 ◽  
Author(s):  
S. E. Babcock ◽  
X. Y. Cai ◽  
D. L. Kaiser ◽  
D. C. Larbalestier
Keyword(s):  
Magnetic Fields ◽  
Grain Boundaries ◽  
Weak Link ◽  
High Magnetic Fields ◽  
High Angle

Effects of high magnetic fields on the microstructures and grain boundaries in binary Al–Li alloy

2009 ◽  
Vol 469 (1-2) ◽  
pp. 258-263 ◽  
Author(s):  
Tie Liu ◽  
Qiang Wang ◽  
Haifeng Zhang ◽  
Ke Wang ◽  
Xuejun Pang ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Grain Boundaries ◽  
High Magnetic Fields

Transport and magnetisation measurements of Tl-1223 tapes-the nature of current paths and the role of grain boundaries at high magnetic fields

1997 ◽  
Vol 7 (2) ◽  
pp. 1965-1968 ◽  
Author(s):  
J. Everett ◽  
M.D. Johnston ◽  
G.K. Perkins ◽  
A.V. Volkozub ◽  
A.D. Caplin ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Grain Boundaries ◽  
High Magnetic Fields

Important Considerations for Processing Bi-Based High-Temperature Superconducting Tapes and Films for Bulk Applications

MRS Bulletin ◽  
1992 ◽  
Vol 17 (8) ◽  
pp. 45-51 ◽  
Author(s):  
Eric E. Hellstrom
Keyword(s):  
High Temperature ◽  
Magnetic Fields ◽  
Materials Science ◽  
Weak Link ◽  
High Temperature Superconductors ◽  
Electromagnetic Properties ◽  
High Magnetic Fields ◽  
Large Current ◽  
Current Densities ◽  
Made In

High-temperature superconductors are brittle oxide ceramics, yet they have been made into wire that has been wrapped into solenoids and used in demonstration magnets and motors. Fabricating wires from these ceramics is an extremely challenging materials science process that requires a precisely engineered microstructure with the correct chemical, mechanical, and electromagnetic properties if these wires are to transport large current densities (Jc) in high magnetic fields. Heine et al. first demonstrated that wires of these materials could carry high Jc in very high magnetic fields. At 4.2 K, the oxide superconducting wires can carry higher Jc at higher magnetic fields than conventional Nb-Ti or Nb3Sn wires (Figure 1), and as shown in the companion article in this issue by Kato et al. they can also have high Jc at 77 K.Of the three major families of high-temperature superconductors, YBa2Cu3O7-x, Bi-Sr-Ca-Cu-O (BSCCO), and Tl-Ba-Ca-Cu-O, the best wires to date have been made in the BSCCO system. At present, all YBa2Cu3O7-x wires are weak linked and have only small Jc in magnetic fields. In the Tl-based system, the superconducting properties are potentially very interesting, but the toxicity of Tl and the system's complex processing have limited conductor development. For the Bi-based system, the basic processing steps are becoming known, the grains are well connected, and the weak link problem can be controlled. This permits applications in the temperature range 4–77 K, depending on the field and current density requirements of the particular use.

Observations and implications of grain boundary dislocation networks in high-angle YBa2Cu3O7−δ grain boundaries

1990 ◽  
Vol 5 (5) ◽  
pp. 919-928 ◽  
Author(s):  
S. E. Babcock ◽  
D. C. Larbalestier
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Weak Link ◽  
Coincidence Site Lattice ◽  
Boundary Structure ◽  
High Angle ◽  
Grain Boundary Structure ◽  
Transmission Electron ◽  
Means Of Transmission ◽  
Regular Networks

Regular networks of localized grain boundary dislocations (GBDs) have been imaged by means of transmission electron microscopy in three different types of high-angle grain boundaries in YBa2Cu3O7-δ, implying that these boundaries possess ordered structures upon which a significant periodic strain field is superimposed. The occurrence of these GBD networks is shown to be consistent with the GBD/Structural Unit and Coincidence Site Lattice (CSL)/Near CSL descriptions for grain boundary structure. Thus, these dislocations appear to be intrinsic features of the boundary structure. The spacing of the observed GBDs ranged from ∼10 nm to ∼100 nm. These GBDs make the grain boundaries heterogeneous on a scale that approaches the coherence length and may contribute to their weak-link character by producing the “superconducting micro-bridge” microstructure which has been suggested on the basis of detailed electromagnetic measurements on similar samples.

Grain Boundaries in Yba2 Cu3O7-δ Thin Films

1989 ◽  
Vol 169 ◽  
Author(s):  
M. Grant Norton ◽  
Lisa A. Tietz ◽  
C. Barry Carter ◽  
Stephen E Russek ◽  
Brian H. Moeckly ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Grain Boundaries ◽  
Weak Link ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Superconducting Films ◽  
High Angle ◽  
Twin Boundaries

AbstractGrain boundaries in YBa2Cu3O7-δ thin films deposited on (001)-MgO by pulsed laser ablation have been characterized using selected area diffraction. In addition to twin boundaries, the presence of both low-angle and high-angle grain boundaries were characteristic of the film's microstructure. The presence of certain grain boundaries may be responsible for the weak-link Josephson behavior observed in small constrictions formed in superconducting films on MgO.

Transport properties of low angle grain boundaries in Y1−xCaxBa2Cu3O7−δ films at high magnetic fields

2006 ◽  
Vol 88 (13) ◽  
pp. 132510 ◽  
Author(s):  
A. Weber ◽  
C. W. Schneider ◽  
S. Hembacher ◽  
Ch. Schiller ◽  
S. Thiel ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Grain Boundaries ◽  
Transport Properties ◽  
High Magnetic Fields

Structure of high-angle-tilt boundaries in YBa2Cu3-O7-x thin films

1991 ◽  
Vol 49 ◽  
pp. 1086-1087
Author(s):  
D. H. Shin ◽  
J. Silcox ◽  
S. E. Russek ◽  
D. K. Lathrop ◽  
B. H. Moeckly ◽  
...  
Keyword(s):  
Thin Films ◽  
Grain Boundaries ◽  
Weak Link ◽  
Boundary Region ◽  
Atomic Scale ◽  
High Resolution Imaging ◽  
High Angle ◽  
Superconducting Properties ◽  
Tilt Boundaries ◽  
Resolution Imaging

It has been known that high angle tilt grain boundaries in c-axis oriented YBa2Cu3O7-x thin films cause weak link behavior in the transport properties reducing Jc's by several orders of magnitude. These grain boundaries have been shown to be clean both structurally and chemically by high resolution imaging and microanalysis studies. Therefore the mechanism of weak link behavior in thin film YBa2Cu3O7-x is not yet understood.Recently it has been deduced from the behavior of weak link Jc under small magnetic fields that the high angle tilt boundaries are nonuniform, consisting of several regions of good contact, each about 5-10 % of the boundary length, with the rest of the boundary region being poor. This seems to suggest that the superconducting properties at the boundary may be sensitive to changes in structures of atomic scale, since typical grain boundaries are free of macroscopic (≥ 10 Å) defects all along the boundaries.

The 45° grain boundaries in YBa2Cu3O7−δ

1992 ◽  
Vol 7 (5) ◽  
pp. 1052-1059 ◽  
Author(s):  
Stuart McKernan ◽  
M. Grant Norton ◽  
C. Barry Carter
Keyword(s):  
Thin Films ◽  
Grain Boundaries ◽  
Electrical Transport ◽  
Weak Link ◽  
High Resolution Electron Microscopy ◽  
Boundary Region ◽  
Boundary Structure ◽  
High Angle ◽  
Electrical Transport Properties ◽  
The Stability

High-angle grain boundaries in YBa2Cu3O7−δ thin films are of technological interest because of the weak coupling observed between the grains; however, not all high-angle grain boundaries show this weak-link behavior. The microstructure of both these boundaries is not understood, nor is the reason for the differing electrical transport properties. High-angle grain boundaries in YBa2Cu3O7−δ thin films on MgO, where the angular misorientation between the grains is ∼45°, have been examined using high-resolution electron microscopy. The results show that the boundary structure can appear quite different even when the angular misorientation between the two grains is the same. The stability of the grain boundaries under the electron irradiation in the electron microscope was found to be a function of the accelerating voltage—400 kV leads to rapid disordering of the boundary region.

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