Ex Situ MgB2 Superconducting Tape with Very High Critical Current Density by Using Low-Temperature Sintering Precursor Powders

2018 ◽  
Vol 32 (5) ◽  
pp. 1225-1230
Author(s):  
X. G. Sun ◽  
X. S. Yang ◽  
X. F. Pan ◽  
D. Xi ◽  
Q. Y. Wang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Ex Situ ◽  
Low Temperature Sintering ◽  
High Critical Current Density ◽  
Superconducting Tape ◽  
Precursor Powders ◽  
Very High

scholarly journals Water based synthesis of highly conductive GaxLi7−3xLa3Hf2O12 garnets with comparable critical current density to analogous GaxLi7−3xLa3Zr2O12 systems

2021 ◽  
Author(s):  
M. P. Stockham ◽  
B. Dong ◽  
M. S. James ◽  
Y. Li ◽  
Y. Ding ◽  
...  
Keyword(s):  
Low Temperature ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Cycling Stability ◽  
High Critical Current Density ◽  
Water Based ◽  
Temperature Water

We report a low temperature, water-based synthesis of Ga0.2Li6.4La3Hf2O12 with high critical current density, cycling stability and no Al3+/Li+ exchange.

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.

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