Solution Processing of YBa2Cu3OT7-x Thin Films

1997 ◽  
Vol 495 ◽  
Author(s):  
A. Singhal ◽  
M. Paranthaman ◽  
E. D. Specht ◽  
R. D. Hunt ◽  
D. B. Beach ◽  
...  
Keyword(s):  
Sol Gel ◽  
Chemical Deposition ◽  
Coated Conductors ◽  
Superconducting Transition ◽  
Axis Orientation ◽  
Ybco Films ◽  
Metal Organic ◽  
Yttrium Isopropoxide ◽  
Oriented Material ◽  
Ybco Coated Conductors

ABSTRACTThe aim of this work was to develop a non-vacuum chemical deposition technique for YBa2Cu3O7-x (YBCO) coated conductors on rolling-assisted biaxially textured substrates (RABiTS). We have chosen the metal-organic decomposition (MOD) and sol-gel precursor routes to grow textured YBCO films. In the MOD process, yttrium 2-ethylhexonate, barium neodecanoate, copper 2-ethylhexonate and toluene were used as the starting reagents. YBCO films processed by the MOD method on SrTiO3 (100) single crystal substrates were predominately epitaxial and consisted of c and a-axis oriented material. Films have a TC,onset of 89K and the best superconducting transition temperature of 63K. Films pyrolyzed at 525 °C and subsequently annealed at 780 °C in P(O2) of 3.5 × 10−4 atm contained YBCO phase predominately in a-axis orientation. In the sol-gel route, yttrium-isopropoxide, barium metal, copper methoxide and 2-methoxyethanol were used as the starting reagents. Sol-gel YBCO films on SrTiO3 substrates were epitaxial and c-axis oriented.

YDyxBa2Cu3O7-δ Epitaxial Films Prepared by Chemical Solution Deposition

2016 ◽  
Vol 848 ◽  
pp. 669-674 ◽  
Author(s):  
Hong Zhang ◽  
Yong Zhao ◽  
Wen Tao Wang ◽  
Yong Zhang ◽  
Ming Lei
Keyword(s):  
Large Scale ◽  
Ybco Film ◽  
Coated Conductors ◽  
Single Crystal Substrate ◽  
Ybco Superconductor ◽  
Axis Orientation ◽  
Ybco Films ◽  
Out Of Plane ◽  
Electric Cables ◽  
Ybco Coated Conductors

YBa2Cu3O7-δ (YBCO) coated conductors have wide-ranging potential in large scale applications, such as, superconducting maglev trains and superconducting electric cables, but low current carrying capability restrains the practical application of YBCO coated conductors at high temperatures and high magnetic fields. It is crucial to develop YBCO coated conductors with high flux pinning capability. In this paper, epitaxial, dense, smooth and crack-free YDyxBa2Cu3O7-δ (x = 0~0.5) films were prepared on a LaAlO3 (LAO) single crystal substrate via a fluorine-free polymer-assisted metal organic deposition (PA-MOD) method. The effects of Dy addition on the microstructure and superconducting character of YBCO films were investigated. The all films show a strong c-axis orientation and good texture in-plane and out of plane. The Dy addition to the YBCO film hardly affects the critical temperature of YBCO superconductor. The irreversibility fields of YBCO films can be improved with the Dy addition x = 0.5 compared to the pure YBCO film but decreased in the x = 0.3 sample.

MOD-Derived YBa2Cu3O7-δ Thin Films using a Fast Pyrolysis Process

2013 ◽  
Vol 745-746 ◽  
pp. 267-274
Author(s):  
Wen Jia Hao ◽  
Yu Ming Lu ◽  
Chuan Yi Bai ◽  
Zhi Yong Liu ◽  
Bo Gao ◽  
...  
Keyword(s):  
Heating Rate ◽  
Scale Up ◽  
Fast Pyrolysis ◽  
Coated Conductors ◽  
Superconducting Transition ◽  
Pyrolysis Process ◽  
Ybco Films ◽  
Metalorganic Deposition ◽  
Surface Morphologies ◽  
Ybco Coated Conductors

In the present work, a fast pyrolysis process is developed for YBa2Cu3O7-δ (YBCO) films preparation with trifluroacetates metalorganic deposition technique (TFA-MOD). The decomposition of TFA salts as well as the surface morphology of pyrolyzed films is investigated with respect to the pyrolysis temperature and its heating rate. Two typical surface morphologies for the pyrolyzed films, being smooth or buckled, are revealed subjecting to the heating rate and film thickness, which related to the subsequent YBCO films property. Smooth and wrinkle-free pyrolyzed films are achieved by using this fast pyrolysis process with a heating rate as high as 5°C/min. The final crystallized YBCO films exhibit good performances with the superconducting transition temperature of 91 K and critical current density of 2.0 MA/cm2 at 77 K, suggesting a rapid, promising MOD route available for scale-up preparation of YBCO coated conductors.

Preparation of YBCO Superconducting Films by Sol-Gel Process

2007 ◽  
Vol 546-549 ◽  
pp. 2007-2010
Author(s):  
Gao Yang Zhao ◽  
Huang Li Zhang ◽  
Ren Zhong Xue ◽  
Yuan Qing Chen ◽  
Li Lei
Keyword(s):  
Sol Gel ◽  
Precursor Solution ◽  
Superconducting Films ◽  
Superconducting Transition ◽  
X Ray Diffraction ◽  
Organic Salts ◽  
Ybco Films ◽  
X Ray ◽  
Sol Gel Process ◽  
Ybco Superconducting Films

precursor solution was prepared using barium trifluoroacetae (Ba-TFA) and non-fluorine yttrium (Y) and copper (Cu) organic salts. The precursor solution was modified by benzalacetone (BzAcH), in which the Cu2+ were chelated with BzAcH, which preventing the loss of Cu in the pyrolysis process. Dense YBCO superconducting films with smooth surface, which confirmed by scanning electron microscopy (SEM), were repeatedly obtained through sol-gel process. X-ray diffraction (XRD) 2θ scanning and φ scanning indicated that the as-prepared YBCO films had good c-axis texture. YBCO films with superconducting transition temperature (TC) above 89K were obtained.

Sol–gel deposition of high-performance Re0.2Ce0.8O2/La2Zr2O7 composite buffer layers on Ni–W tapes for YBCO coated conductors

2015 ◽  
Vol 77 (1) ◽  
pp. 94-99 ◽  
Author(s):  
Weibai Bian ◽  
Yuanqing Chen ◽  
Xinni Tang ◽  
Weihua Zhang ◽  
Gaoyang Zhao ◽  
...  
Keyword(s):  
High Performance ◽  
Sol Gel ◽  
Coated Conductors ◽  
Buffer Layers ◽  
Ybco Coated Conductors

Fabrication of High Jc YBa2Cu3O7-δ Coated Conductors Using Sol-Gel Buffer Layers On Nickel and Nickel Alloy Substrates

2001 ◽  
Vol 689 ◽  
Author(s):  
S. Sathyamurthy ◽  
M. Paranthaman ◽  
B. W. Kang ◽  
H. Y. Zhai ◽  
T. Aytug ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Sol Gel ◽  
Rf Sputtering ◽  
Cube Texture ◽  
Dip Coating ◽  
Coated Conductors ◽  
Buffer Layers ◽  
Ybco Films

Sol-gel processing of La2Zr2O7 (LZO) buffer layers on biaxially textured Ni-3 at.% W alloy substrates using a continuous reel-to-reel dip-coating unit has been studied. The epitaxial LZO films obtained have a strong cube texture and uniform microstructure. The effect of increasing the annealing speed on the texture, microstructure and the carbon content retained in the film were studied. On top of the LZO films, epitaxial layers of Yttria Stabilized Zirconia (YSZ) and Ceria (CeO2) were deposited using rf sputtering, and YBa2Cu3Ox (YBCO) films were then deposited using Pulsed Laser Deposition (PLD). A critical current density (Jc) of 1.9 MA/cm2 at 77K and self-field and 0.34 MA/cm2 at 77K and 0.5T have been obtained on these films. These values are comparable to those obtained on YBCO films deposited on all-vacuum deposited buffer layers, and are the highest ever obtained using solution seed layers. The use of all-solution buffers for coated conductor processing has also been explored. A critical current density of 1.1 MA/cm2 at 77 K and self-field was obtained on YBCO films grown be PLD on LZO buffered nickel substrates.

Development of a metal-organic deposition process for growth of lanthanum manganate buffer layers for coated conductors

2009 ◽  
Vol 24 (4) ◽  
pp. 1567-1575 ◽  
Author(s):  
Kartik Venkataraman ◽  
Eric Hellstrom
Keyword(s):  
Single Layer ◽  
Deposition Process ◽  
Coated Conductors ◽  
Buffer Layers ◽  
Process Window ◽  
Film Forming ◽  
Metal Organic ◽  
Organic Precursors ◽  
Metal Organic Deposition ◽  
Ybco Coated Conductors

One embodiment of YBa2Cu3O7-x (YBCO)-coated conductors consists of YBCO film grown using a metal-organic deposition (MOD) process on a buffer layer stack deposited on a Ni-W substrate. A possible alternative is to replace the multilayer buffer stack with a single layer of LaMnO3 (LMO) grown by MOD. A suitable temperature (T) – oxygen partial pressure (PO2) process-window to grow LMO films via MOD on Ni substrates has been identified. Untextured LMO was grown on pure Ni. However, we have not been able to grow phase-pure LMO films on either bare or Y2O3-coated, biaxially textured Ni-5W (at.%) due to the incongruent, overlapping requirements of having the PO2 low enough to not oxidize the Ni-5W substrate but high enough to convert the metal-organic precursors to LMO and the relatively high temperatures needed to form an epitaxial film in an MOD process. The main problem is that tungsten from the substrate reacts with cations in the overlying film forming tungstates when the films are processed in the T-PO2 window.

YBCO-Coated Conductors Manufactured by High-Rate Pulsed Laser Deposition

MRS Bulletin ◽  
2004 ◽  
Vol 29 (8) ◽  
pp. 583-589 ◽  
Author(s):  
Alexander Usoskin ◽  
Herbert C. Freyhardt
Keyword(s):  
Pulsed Laser Deposition ◽  
High Temperature Superconductors ◽  
Pulsed Laser ◽  
Critical Currents ◽  
Coated Conductors ◽  
Laser Deposition ◽  
High Rate ◽  
Quasi Equilibrium ◽  
Ybco Films ◽  
Ybco Coated Conductors

AbstractHigh-temperature superconductors of the second generation—coated conductors—are based on an architecture of YBCO films deposited on a well-textured substrate tape. The deposition technique used in the processing of YBCO films is responsible not only for both the resulting critical currents in the conductors and the cost efficiency of the employed production route, but also for the ultimate viability of the chosen technology. This article describes an advanced deposition method for YBCO films using high-rate pulsed laser deposition (HR-PLD).An elaborate variable azimuth ablation allows target roughening to be considerably reduced in the course of continuous deposition, and as a result, the integral deposition speed and speed stability can be increased to technologically interesting high values.Well-selected process parameters have been demonstrated to yield high currents of up to 480A/cm-width in short tapes and 360A/cm-width in 6-m-long tapes.Together with quasi-equilibrium heating, the HR-PLD method allows the processing of long-length YBCO-coated conductors and offers a cost-efficient route for their production on an industrial scale.

Preparation of The Double-Sided YBa2Cu3O7-δ Thin Film by Hot-Wall Type Mocvd

1997 ◽  
Vol 474 ◽  
Author(s):  
Y. Ito ◽  
M. Iwata ◽  
Y. Yoshida ◽  
Y. Takai ◽  
I. Hirabayashi
Keyword(s):  
Gas Flow ◽  
Single Phase ◽  
Ybco Film ◽  
Chemical Vapor ◽  
Organic Chemical ◽  
Axis Orientation ◽  
Ybco Films ◽  
Metal Organic ◽  
Organic Chemical Vapor Deposition ◽  
Source Materials

ABSTRACTA hot-wall type metal organic chemical vapor deposition (MOCVD) apparatus has been developed for the deposition of the YBa2Cu3O7-δ (YBCO) films using liquid metal organic sources on arbitrary shaped substrates. By improving the reactor shape and gas flow of the source materials, we succeeded in fabricating the double-sided YBCO films for electronic and microwave devices and the YBCO-coated conductor on oxide fiber for power applications. Tc(zero)'s of the YBCO film on both sides of the LaAlO3 (100) substrate were 90K and 86K, respectively. The films on the facet of the single crystalline SrTiO3 fiber showed the single phase c-axis orientation with biaxially alignment in the a / b plane.

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