Grain boundary networks in Y123 coated conductors: Formation, properties and simulation

2001 ◽  
Vol 11 (1) ◽  
pp. 3872-3875 ◽  
Author(s):  
B. Holzapfel ◽  
L. Fernandez ◽  
F. Schindler ◽  
B. de Boer ◽  
N. Reger ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Coated Conductors

Grain and grain-boundary critical currents in coated conductors with noncorrelating YBa2Cu3O7 and substrate grain-boundary networks

2006 ◽  
Vol 88 (13) ◽  
pp. 132508 ◽  
Author(s):  
A. Palau ◽  
T. Puig ◽  
X. Obradors ◽  
R. Feenstra ◽  
A. A. Gapud ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Critical Currents ◽  
Coated Conductors

scholarly journals Individual grain boundary properties and overall performance of metal-organic deposition coated conductors

2010 ◽  
Vol 81 (17) ◽  
Author(s):  
M. Weigand ◽  
S. C. Speller ◽  
G. M. Hughes ◽  
N. A. Rutter ◽  
S. Lozano-Perez ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Coated Conductors ◽  
Boundary Properties ◽  
Metal Organic ◽  
Overall Performance ◽  
Metal Organic Deposition

Three Dimensional Observation of Flux Pinning Centers in Dy-doped YBa2Cu3O7-x Coated Superconductors by STEM Tomography

2007 ◽  
Vol 1026 ◽  
Author(s):  
Volkan Ortalan ◽  
Miriam Herrera ◽  
David G. Morgan ◽  
Martin W. Rupich ◽  
Nigel D. Browning
Keyword(s):  
Particle Size ◽  
Grain Boundary ◽  
Flux Pinning ◽  
Three Dimensional ◽  
Scanning Transmission Electron Microscope ◽  
Coated Conductors ◽  
Chemical Doping ◽  
Pinning Centers ◽  
Scanning Transmission ◽  
Conductive Properties

AbstractThe spatial distribution of flux pinning centers in YBa2Cu3O7 (YBCO) coated conductors significantly affects the conductive properties. Nanoparticles acting as pinning centers can be intentionally introduced into the structure by chemical doping. In this study, a Dy-doped YBa2Cu3O7-x coated superconductor was investigated and the particle composition was found to be as (YsDy1-s)2Cu2O5 with s ∼0.6. A tomographic tilt series was acquired using a scanning transmission electron microscope (STEM) to determine the 3-D distribution of nanoparticles. In the investigated sample area, 71 particles were located with a particle size distribution ranging between 13 and 135 nm. The distribution uniformity and size of the particles appeared to be dependent on the grain boundary network structure. Large particles were observed to be located on grain boundaries indicating that fast grain boundary diffusion may determine the particle size.

TEM Characterization of Grain Boundary Structure in YBCO Coated Conductors

2000 ◽  
Vol 6 (S2) ◽  
pp. 394-395
Author(s):  
H. Kung ◽  
J.P. Hirth ◽  
S.R. Foltyn ◽  
P.N. Arendt ◽  
Q.X. Jia ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Critical Current Density ◽  
Grain Boundaries ◽  
Critical Current ◽  
Current Density ◽  
Lattice Mismatch ◽  
Coupling Effect ◽  
High Temperature Superconductors ◽  
Coated Conductors ◽  
Boundary Structure

Studies of defects, such as grain boundaries, in high temperature superconductors (HTS) are important due to the interaction of the defects with flux-bearing vortices. The benefit of in-plane grain alignment has been documented in YBCO thin film bicrystals, in which the high critical current density (Jc) observed across small angle grain boundaries deteriorates exponentially with grain boundary angles beyond ∼ 7°. In addition to the weak coupling effect, a grain boundary may also influence the transport properties via the grain boundary dislocations (GBDs) serving as pinning centers to increase the critical current density. There have been a number of studies on grain boundary structures in YBCO. Despite many differences in structure among the different types of boundaries, it has been established that the low angle [001] tilt boundary in YBCO consists of aperiodic array of edge type GBDs with [100] type Burgers vector that accommodate the lattice mismatch, and the regions between the GBDs are channels of relatively undisturbed lattices [1].

scholarly journals Grain boundary transport properties in YBa/sub 2/Cu/sub 3/O/sub x/ coated conductors

2001 ◽  
Vol 11 (1) ◽  
pp. 3868-3871 ◽  
Author(s):  
P. Berghuis ◽  
D.J. Miller ◽  
D.H. Kim ◽  
K.E. Gray ◽  
R. Feenstra ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Transport Properties ◽  
Coated Conductors ◽  
Grain Boundary Transport

Evidence for Extensive Grain Boundary Meander and Overgrowth of Substrate Grain Boundaries in High Critical Current Density ex Situ YBa2Cu3O7−x Coated Conductors

2005 ◽  
Vol 20 (8) ◽  
pp. 2012-2020 ◽  
Author(s):  
D.M. Feldmann ◽  
D.C. Larbalestier ◽  
T. Holesinger ◽  
R. Feenstra ◽  
A.A. Gapud ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Critical Current Density ◽  
Film Thickness ◽  
Critical Current ◽  
Current Density ◽  
Thick Films ◽  
Coated Conductors ◽  
Ex Situ ◽  
High Critical Current Density ◽  
Ybco Films

It has been generally accepted that YBa2Cu3O7−x (YBCO) films deposited on deformation textured polycrystalline metal tapes result in YBCO grain boundary (GB) networks that essentially replicate the GBs of the underlying substrate. Here we report that for thicker YBCO films produced by a BaF2 ex situ process, this is not true. Using electron backscatter diffraction combined with ion milling, we have been able to map the evolution of the YBCO grain structure and compare it to the underlying template in several coated conductors. For thin (≤0.5 μm) YBCO films deposited on rolling-assisted biaxially textured substrates (RABiTS), the YBCO GBs nearly directly overlap the substrate GBs. For 0.7–1.4 μm YBCO films, the GBs were found to meander along the substrate GBs and along the sample normal, with displacements several times the film thickness. In very thick films (2.5–2.9 μm), the YBCO grains can completely overgrow substrate grains and GBs, resulting in a substantial disconnection of the YBCO and substrate GB networks. Similar behavior is found for BaF2 ex situ YBCO films on ion-beam-assisted deposition-type templates. The ability of the YBCO to overgrow substrate grains and GBs is believed to be due to liquid-phase mediated laminar grain growth. Although the behavior of the YBCO GB networks changes with YBCO film thickness, the samples maintained high critical current density (Jc) values of >2 MA/cm2 for films up to 1.4 μm thick, and up to0.9 MA/cm2 for 2.5–2.9-μm-thick films.

Low angle grain boundary transport in YBa2Cu3O7−δ coated conductors

2000 ◽  
Vol 76 (13) ◽  
pp. 1755-1757 ◽  
Author(s):  
D. T. Verebelyi ◽  
D. K. Christen ◽  
R. Feenstra ◽  
C. Cantoni ◽  
A. Goyal ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Coated Conductors ◽  
Grain Boundary Transport
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