High Performance YBCO Films

1992 ◽  
Author(s):  
Edgar J. Denlinger
Keyword(s):  
High Performance ◽  
Ybco Films

An evaluation of phase separated, self-assembled LaMnO3-MgO nanocomposite films directly on IBAD-MgO as buffer layers for flux pinning enhancements in YBa2Cu3O7-δ coated conductors

2010 ◽  
Vol 25 (3) ◽  
pp. 437-443 ◽  
Author(s):  
Özgür Polat ◽  
Tolga Aytug ◽  
M. Parans Paranthaman ◽  
Keith J. Leonard ◽  
Andrew R. Lupini ◽  
...  
Keyword(s):  
Flux Pinning ◽  
High Performance ◽  
Superconducting Devices ◽  
Microstructural Characterization ◽  
Coated Conductors ◽  
Buffer Layers ◽  
Nanocomposite Films ◽  
Two Phase ◽  
Ybco Films ◽  
Self Assembled

Technological applications of high temperature superconductors (HTS) require high critical current density, Jc, under operation at high magnetic field strengths. This requires effective flux pinning by introducing artificial defects through creative processing. In this work, we evaluated the feasibility of mixed-phase LaMnO3:MgO (LMO:MgO) films as a potential cap buffer layer for the epitaxial growth and enhanced performance of YBa2Cu3O7-δ (YBCO) films. Such composite films were sputter deposited directly on IBAD-MgO templates (with no additional homo-epitaxial MgO layer) and revealed the formation of two phase-separated, but at the same time vertically aligned, self-assembled composite nanostructures that extend throughout the entire thickness of the film. The YBCO coatings deposited on these nanostructured cap layers showed correlated c-axis pinning and improved in-field Jc performance compared to those of YBCO films fabricated on standard LMO buffers. Microstructural characterization revealed additional extended disorder in the YBCO matrix. The present results demonstrate the feasibility of novel and potentially practical approaches in the pursuit of more efficient, economical, and high performance superconducting devices.

The RABiTS Approach: Using Rolling-Assisted Biaxially Textured Substrates for High-Performance YBCO Superconductors

MRS Bulletin ◽  
2004 ◽  
Vol 29 (8) ◽  
pp. 552-561 ◽  
Author(s):  
Amit Goyal ◽  
M. Parans Paranthaman ◽  
U. Schoop
Keyword(s):  
Critical Current ◽  
High Performance ◽  
Thermomechanical Processing ◽  
Cost Effective ◽  
Epitaxial Films ◽  
Buffer Layers ◽  
Ybco Films ◽  
Biaxial Texture ◽  
Ybco Superconductors ◽  
Current Densities

AbstractThis article provides an overview of the fabrication of epitaxial, biaxially aligned buffer layers on rolling-assisted biaxially textured substrates (RABiTS) as templates for YBCO films carrying high critical current densities.The RABiTS technique uses standard thermomechanical processing to obtain long lengths of flexible, biaxially oriented substrates with smooth surfaces.The strong biaxial texture of the metal is conferred to the superconductor by the deposition of intermediate metal and/or oxide layers that serve both as a chemical and a structural buffer.Epitaxial YBCO films with critical current densities exceeding 3 106A/cm2at 77K in self-field have been grown on RABiTS using a variety of techniques and demonstrate magnetic-field-dependent critical current values that are similar to those of epitaxial films on single-crystal ceramic substrates.The RABiTS architecture most commonly used consists of a CeO2 (sputtered)/YSZ (sputtered)/Y203 (e-beam)/Ni-W alloy.The desired texture of the base metal has been achieved in 100 m lengths and 10cm widths.Scaleable and cost-effective techniques are also being pursued to deposit the epitaxial multilayers.The results discussed here demonstrate that this technique is a viable route for the fabrication of long lengths of high-critical-current-density wire capable of carrying high currents in magnetic fields and at temperatures accessible by cooling with relatively inexpensive liquid nitrogen (up through the 77K range).

Liquid Phase Enhanced Hybrid MOD Approach for High Performance YBCO Films Development

2005 ◽  
Vol 15 (2) ◽  
pp. 2617-2619 ◽  
Author(s):  
Y. Xu ◽  
A. Goyal ◽  
K. Leonard ◽  
L. Heatherly ◽  
P. Martin
Keyword(s):  
Liquid Phase ◽  
High Performance ◽  
Ybco Films

High Performance YBCO Films

1992 ◽  
Author(s):  
Edgar J. Denlinger
Keyword(s):  
High Performance ◽  
Ybco Films

High performance YBCO films by the hybrid of non-fluorine yttrium and copper salts with Ba–TFA

2005 ◽  
Vol 421 (1-4) ◽  
pp. 67-72 ◽  
Author(s):  
Y. Xu ◽  
A. Goyal ◽  
K. Leonard ◽  
P. Martin
Keyword(s):  
High Performance ◽  
Copper Salts ◽  
Ybco Films

Progress towards a low-cost commercial coated conductor

2001 ◽  
Vol 689 ◽  
Author(s):  
Suresh Annavarapu ◽  
Nguyet Nguyen ◽  
Sky Cui ◽  
Urs Schoop ◽  
Cees Thieme ◽  
...  
Keyword(s):  
Critical Current ◽  
High Performance ◽  
Low Cost ◽  
Critical Currents ◽  
Short Length ◽  
Coated Conductor ◽  
High Quality ◽  
Ybco Films ◽  
Performance Levels ◽  
Current Densities

ABSTRACTYBCO films prepared from metal trifluoroacetate (TFA) precursors on oxide-buffered textured non-magnetic substrates have achieved performance levels equaling that on oxide buffered textured Ni substrates. Critical current densities of 0.7 MA/cm2 to 1.0 MA/cm2 have been achieved in 0.4 µm thick YBCO films on short-length of CeO2/YSZ/Y2O3/Ni/Ni-13wt%Cr substrates. High-quality epitaxial buffers comprising a Ni layer, Y2O3 seed, YSZ barrier and CeO2 cap layers have been deposited over meter long tapes of deformation textured Ni and Ni-13%Cr using reel-to-reel processes. High-performance TFA-based YBCO films have been deposited on 0.1 m to 0.3 m lengths of these oxide buffered substrates using reel to reel processes. Critical current densities up to 1.0 MA/cm2 have been achieved in 0.4 µm thick YBCO films on CeO2/YSZ/Y2O3/Ni substrates. Using multiple coats of the metal trifluoroacetate precursors, thicker YBCO films have been demonstrated on oxide buffered substrates. Critical currents in excess of 100A/cm-width have been achieved for 1.2 µm -1.6 µm thick YBCO films on short lengths of CeO2/YSZ/Y2O3/Ni substrates.

Textured YBCO Films Derived from Low-Fluorine-Content Solution

2007 ◽  
Vol 546-549 ◽  
pp. 2003-2006
Author(s):  
Yuan Qing Chen ◽  
Gao Yang Zhao ◽  
Li Lei ◽  
Di Chun Chen
Keyword(s):  
Electron Microscopy ◽  
High Performance ◽  
Fluorine Content ◽  
Film Surface ◽  
Furnace Atmosphere ◽  
Zero Magnetic Field ◽  
X Ray Diffraction ◽  
Ybco Films ◽  
Transmission Electron ◽  
Barium Copper

with yttrium, barium, copper acetates as starting materials, a low-fluorine-content solution was prepared. YBa2Cu3O7-x (YBCO) films on LaAlO3 (LAO) single crystal substrates were fabricated by a new TFA-MOD method. Solution-derived YBCO films exhibited epitaxial growth, which was confirmed by X-ray diffraction (XRD). The humidity of the furnace atmosphere during annealing process influences the texture of YBCO film. Under high-humidity of furnace atmosphere, a-oriented grains, which were confirmed by scanning electron microscopy (SEM), were generated on film surface. High-resolution transmission electron microscopy (HRTEM), however, indicated that although a-axis oriented grains formed on the film surface, c-axis oriented grains occupied the area near the YBCO/LAO interface. High-performance YBCO films with Tc above 90K, and Jc more than 106A/cm2 at 77 K and zero magnetic field were obtained.

scholarly journals Low-Fluorine Ba-Deficient Solutions for High-Performance Superconducting YBCO Films

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 199 ◽  
Author(s):  
Pau Ternero ◽  
Jordi Alcalà ◽  
Laura Piperno ◽  
Cornelia Pop ◽  
Susagna Ricart ◽  
...  
Keyword(s):  
Thermal Annealing ◽  
Chemical Solution Deposition ◽  
High Performance ◽  
Clear Correlation ◽  
Chemical Solution ◽  
Superconducting Properties ◽  
Solution Deposition ◽  
Ybco Films ◽  
High Performing

High-performing superconducting YBa2Cu3O7–x (YBCO) films are fabricated by a chemical solution deposition methodology through novel barium-deficient low-fluorine solutions. The precursor solutions, distinguished for being straightforward, inexpensive and eco-friendly, allow us to reduce the growing temperature of YBCO down to 750 °C. We investigated the influence of the growing temperatures on both the microstructure and superconducting properties of YBCO films by using conventional thermal annealing and flash-heating approaches. A clear correlation between the growing temperature (Tg) and the superconducting performance of the films was obtained with improved performances observed at low Tg.

Metalorganic Deposition of YBCO Films for Second-Generation High-Temperature Superconductor Wires

MRS Bulletin ◽  
2004 ◽  
Vol 29 (8) ◽  
pp. 572-578 ◽  
Author(s):  
Martin W. Rupich ◽  
Darren T. Verebelyi ◽  
Wei Zhang ◽  
Thomas Kodenkandath ◽  
Xiaoping Li
Keyword(s):  
High Temperature ◽  
High Performance ◽  
High Temperature Superconductor ◽  
Second Generation ◽  
Ybco Film ◽  
Low Cost ◽  
High Rate ◽  
Ybco Films ◽  
Metalorganic Deposition ◽  
Film Fabrication

AbstractMetalorganic deposition (MOD) is an attractive process for low-cost, high-rate deposition of YBa2Cu3O7– (YBCO) films on continuous lengths of biaxially textured metallic templates for second-generation (2G) high-temperature superconductor (HTS) wires.MOD of YBCO films involves four steps:precursor synthesis, coating, decomposition, and reaction.The final films must meet stringent requirements, including high critical current, uniformity across the width and along the length of the textured substrate, and excellent mechanical properties.Achieving these properties has required the development of a metalorganic precursor that produces an intermediate BaF2-based film, which in turn is converted to a high-quality YBCO film.Understanding and controlling the deposition of the metalorganic precursor and its conversion to YBCO are critical to reproducibly manufacturing uniform, high-performance, HTS wires required for commercial applications.This article reviews the issues that must be addressed in the use of MOD for low-cost YBCO film fabrication and summarizes the performance of 2G HTS wires prepared by this manufacturing process.

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