Ultralow-fluorine sol–gel deposition of thick YBCO multilayer films

Huang

et al. 2016

Sci Rep

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Although the solution deposition of YBa2Cu3O7−x (YBCO) superconducting films is cost effective and capable of large-scale production, further improvements in their superconductivity are necessary. In this study, a deep UV (DUV) irradiation technique combined with a low-fluorine solution process was developed to prepare YBCO films. An acrylic acidic group as the chelating agent was used in the precursor solution. The acrylic acidic group was highly sensitive to DUV light at 254 nm and significantly absorbed UV light. The coated gel films exposed to DUV light decomposed at 150 °C and copper aggregation was prevented. The UV irradiation promoted the removal of the carbon residue and other by-products in the films, increased the density and enhanced the crystallinity and superconductivity of the YBCO films. Using a solution with F/Ba = 2, YBCO films with thicknesses of 260 nm and enhanced critical current densities of nearly 8 MA/cm2 were produced on the LaAlO3 (LAO) substrates.

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Section: Resultsmentioning

confidence: 87%

High Critical Current Density of YBa2Cu3O7−x Superconducting Films Prepared through a DUV-assisted Solution Deposition Process

Huang

et al. 2016

Sci Rep

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“…The La 2 Zr 2 O 7 (LZO) precursor solution with cation concentration of 0.3 mol/L was prepared by dissolving the lanthanum acetate, zirconium acetylacetonate in the mixture solution of propionic acid and methanol. The precursor YBCO solution with a mole ratio of F/Ba = 2 was synthesized according to the route we reported elsewhere [23,24].…”

Section: Methodsmentioning

confidence: 99%

“…And then twolayer Re 0.2 Ce 0.8 O 2 films were deposited on them. The YBCO films coated on the buffer layers were fabricated according to the method we reported elsewhere [24].…”

Section: Methodsmentioning

confidence: 99%

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

Tang

et al. 2015

J Sol-Gel Sci Technol

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Gd-, Y-, and La-doped CeO 2 films (Gd 0.2-Ce 0.8 O 2 , Y 0.2 Ce 0.8 O 2 , and La 0.2 Ce 0.8 O 2 ) are prepared on Ni-W tapes and La 2 Zr 2 O 7 -buffered Ni-W tapes using solgel method. The films are characterized by X-ray diffraction and atomic force microscopy. Results indicate that Y 0.2 Ce 0.8 O 2 (YCO) film shows the better crystallinity and the surface quality compared with Gd 0.2 Ce 0.8 O 2 (GCO) and La 0.2 Ce 0.8 O 2 (LCO) films. The YCO buffer layer has good in-plane texture with purely c-oriented grains. The YCO films deposited on La 2 Zr 2 O 7 (LZO) also demonstrate the good texture and the perfect surface quality. YBCO films are prepared on the YCO/LZO and LCO/LZO composite buffer layers through the low fluorine solution route. The YBCO film deposited on the YCO/LZO buffer layer displays a high T c of 89.6 K with a low transition temperature width (DT = 0.45 K), and a J c value of 0.5 MA/cm 2 , which is superior to that deposited on LCO/LZO buffer layer. Graphical Abstract Gd-, Y-, and La-doped CeO 2 films (Gd 0.2 Ce 0.8 O 2 , Y 0.2 Ce 0.8 O 2 , and La 0.2 Ce 0.8 O 2 ) are prepared on Ni-W tapes through sol-gel method. GCO film has a coarse surface, and the YCO film has the best texture and surface quality. Y 0.2 Ce 0.8 O 2 /La 2 Zr 2 O 7 and La 0.2 Ce 0.8 O 2 / La 2 Zr 2 O 7 composite buffer layers are also prepared and compared. The surface quality of Y 0.2 Ce 0.8 O 2 /La 2 Zr 2 O 7 is superior to that of La 0.2 Ce 0.8 O 2 /La 2 Zr 2 O 7 composite buffer layer. High-T c YBCO films with sharp DT = 0.45 K and a J c value of 0.5 MA/cm 2 are successfully obtained on the Y 0.2 Ce 0.8 O 2 /La 2 Zr 2 O 7 film, which is superior to that on La 0.2 Ce 0.8 O 2 /La 2 Zr 2 O 7 buffer layer.

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Effect of La/Zr ratio in the precursor solution on the properties of La2Zr2O7 and CeO2/La2Zr2O7 films

Tang

et al. 2017

J Sol-Gel Sci Technol