Preparation of Coated Conductors With Fluorine-Free CSD Method

Lei, Ming; Wang, W.T.; Pu, M.H.; Zhang, Haijun; Xiao-bing, Zhang; Zhang, Ye; Zhao, Yiqi

doi:10.1109/tasc.2014.2370795

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…The MOD method is a simple and low-cost process to prepare REBCO films. In particular, when we adopt the fluorine-free MOD (FF-MOD) method [15][16][17][18][19][20][21][22][23], REBCO crystals are formed in a very short sintering time [20,21] without generation of harmful gases compared to the TFA-MOD method, which requires relatively long sintering for several hours [24,25]. However, FF-MOD-processed REBCO films show rapid decrease in J c with magnetic field possibly due to lack of defects acting as effective pinning centers.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and improvedJ_c–Hcharacteristics of Cl-containing YBCO thin films prepared by the fluorine-free MOD method

Motoki

Shimoyama

Kishio

et al. 2015

Supercond. Sci. Technol.

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Undoped, Cl-doped, (Cl, Hf) co-doped and (Cl, Sn) co-doped YBa2Cu3Oy (YBCO) thin films have been prepared by the fluorine-free metal–organic decomposition (FF-MOD) method on SrTiO3(100) single-crystalline substrates. Cross-sectional microstructures of these films were investigated in detail using scanning transmission electron microscopy (STEM). Rectangular-shaped oxychloride precipitates (Ba2Cu3O4Cl2) and fine particles (BaSnO3) were clearly observed in the (Cl, Sn) co-doped films. The magnetic angular dependence of the critical current density (Jc–H–θ) of these films was evaluated. The existence of c-axis-correlated type pinning centers was suggested in Cl-containing YBCO films, whereas this type of pinning is not common in MOD-processed films. Jc values were enhanced by Cl doping and further by (Cl, Sn) co-doping in all magnetic field directions at 77 K. This improved Jc–H–θ property with c-axis-correlated pinning sites is the first report in FF-MOD-processed YBCO films.

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Section: Introductionmentioning

confidence: 99%

Microstructures and improvedJ_c–Hcharacteristics of Cl-containing YBCO thin films prepared by the fluorine-free MOD method

Motoki

Shimoyama

Kishio

et al. 2015

Supercond. Sci. Technol.

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“…The particular epitaxial feature of NiO layer benefits from the orientation induction of highly biaxial textured NiW substrate and Increased-LGZO film distributed on both sides. The NiO layer that is quite dense and uniform with well-aligned grains can weaken the further diffusion of elements [36][37][38]. The HAADF image contrast is associated with the average atomic number.…”

Section: Microstructure Of Niw/increased-lgzo/ybco Characterized By Temmentioning

confidence: 99%

Highly epitaxial YBa₂Cu₃O_7−δ films grown on gradient La_2−xGd _x Zr₂O₇-buffered NiW-RABiTS using all sol–gel process

Liu¹,

Li²,

Zhao³

et al. 2021

Supercond. Sci. Technol.

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The overall purpose of this work is to develop a reliable and low-cost technique for fabrication of coated conductors (CCs) on the flexible substrates, and to understand the effects of oriented growth and microstructure on the superconducting performance of CCs in-depth. The investigations of gradient La2−x Gd x Zr2O7 buffer architecture and YBa2Cu3O7−δ (YBCO) film on Ni-5at%W rolling-assisted biaxially textured substrate using all sol–gel process are reported. Combining x-ray diffraction and transmission electron microscopy (TEM) analysis, it is revealed that the gradient buffer architecture with increased lattice constant along the direction of film growth has an excellent c-axis orientation, while the inversed gradient architecture with decreased lattice constant shows the deteriorated orientation, indicating that the highly epitaxial growth mechanism most likely related to the interfacial lattice matching degree. The detailed analysis of YBCO films grown on gradient La2−x Gd x Zr2O7 under different deposition parameters, and the influence of microstructure on electrical properties are systematically discussed using x-ray diffraction, rocking curve test, scanning electron microscopy and TEM observations. Finally, the excellent biaxial texture YBCO film on gradient La2−x Gd x Zr2O7 buffer architecture is prepared at a proper heat-treatment temperature of 780 °C, and the full width at half maximum of ϕ-scan and ω-scan are 5.9° and 6.4°, respectively. The critical transition temperature T c,onset of the as-prepared YBCO film is 90 K. With elevating the temperatures, the appearance of a large number of weak-link and amorphous regions, being indicative of the microstructural collapse, is mainly responsible for the reduced superconductivity.

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Promotion of Epitaxial Growth and Enhanced <italic>J</italic>_c by Coaddition of Br and Metals (Zr, Sn, Hf) to the Fluorine-Free MOD Processed YBCO Films

Motoki

Ikeda

Gondo

et al. 2019

IEEE Trans. Appl. Supercond.

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Preparation of Coated Conductors With Fluorine-Free CSD Method

Cited by 3 publications

References 19 publications

Microstructures and improvedJ_c–Hcharacteristics of Cl-containing YBCO thin films prepared by the fluorine-free MOD method

Microstructures and improvedJ_c–Hcharacteristics of Cl-containing YBCO thin films prepared by the fluorine-free MOD method

Highly epitaxial YBa₂Cu₃O_7−δ films grown on gradient La_2−xGd _x Zr₂O₇-buffered NiW-RABiTS using all sol–gel process

Promotion of Epitaxial Growth and Enhanced <italic>J</italic>_c by Coaddition of Br and Metals (Zr, Sn, Hf) to the Fluorine-Free MOD Processed YBCO Films

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Preparation of Coated Conductors With Fluorine-Free CSD Method

Cited by 3 publications

References 19 publications

Microstructures and improvedJc–Hcharacteristics of Cl-containing YBCO thin films prepared by the fluorine-free MOD method

Microstructures and improvedJc–Hcharacteristics of Cl-containing YBCO thin films prepared by the fluorine-free MOD method

Highly epitaxial YBa2Cu3O7−δ films grown on gradient La2−x Gd x Zr2O7-buffered NiW-RABiTS using all sol–gel process

Promotion of Epitaxial Growth and Enhanced <italic>J</italic>c by Coaddition of Br and Metals (Zr, Sn, Hf) to the Fluorine-Free MOD Processed YBCO Films

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Microstructures and improvedJ_c–Hcharacteristics of Cl-containing YBCO thin films prepared by the fluorine-free MOD method

Microstructures and improvedJ_c–Hcharacteristics of Cl-containing YBCO thin films prepared by the fluorine-free MOD method

Highly epitaxial YBa₂Cu₃O_7−δ films grown on gradient La_2−xGd _x Zr₂O₇-buffered NiW-RABiTS using all sol–gel process

Promotion of Epitaxial Growth and Enhanced <italic>J</italic>_c by Coaddition of Br and Metals (Zr, Sn, Hf) to the Fluorine-Free MOD Processed YBCO Films