NDLI: Water-Vapor-Controlled Reaction for Fabrication of YBCO Films by Fluorine-Free Sol-Gel Process

Content Provider	IEEE Xplore Digital Library
Author	Li Lei Gaoyang Zhao Juanjuan Zhao Hui Xu
Copyright Year	2002
Abstract	Fluorine-free sol-gel process is a potential technique in preparing YBa₂Cu₃O_7-δ (YBCO) films due to avoiding the release of HF gas. In this paper, yttrium acetate, barium acetate, and copper acetate are used as the starting materials to synthesize a novel YBCO fluorine-free precursor solution. The phase evolution during the heat-treatment process of YBCO films and YBCO phase formation were studied, and the results show that the introduction of water vapor at the stage of high-temperature heat treatment can make the BaCO₃ phase become converted into the Ba(OH)₂ phase, which can be used as the barium source to react with CuO and Y₂O₃ to generate the YBCO phase, thus achieving the purpose for fabrication of high-performance YBCO films by fluorine-free sol-gel process. Through this approach, YBCO films with c-axis orientation and an excellent superconducting property can be obtained on a (001)-oriented LaAlO₃ (LAO) substrate. Superconducting property tests indicate that the superconducting critical transition temperature T_c is approximately 90 K, and the transition width T deduced from the R-T curve is less than 1 K; the critical current density J_c is 1.65 MA/cm² (77 K, 0 T), as tested by an electric transport method, and 1.83 MA/cm² (77 K, 0 T), as measured by magnetization measurement.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2286
Ending Page	2293
Page Count	8
File Size	807155
File Format	PDF
ISSN	10518223
Volume Number	20
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fabrication Yttrium barium copper oxide Superconducting films Superconducting transition temperature High temperature superconductors Heat treatment Water heating Testing Density measurement Current measurement $\hbox{YBa}_{2}\hbox{Cu}_{3}\hbox{O}_{7-\delta}$ (YBCO) films Fluorine free high-temperature superconductivity sol-gel
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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${hbox{YBa}}_{2}{hbox{Cu}}_{3}{hbox{O}}_{7{hbox{-}}delta}$ Formation by Processing of Laser-Ablated, Fluorine-Free Precursor Films

Microstructure and Superconducting Behavior of ${hbox{YBa}}_{2}{hbox{Cu}}_{3}{hbox{O}}_{7-delta}$ Films Fabricated From Colloids of Nanoparticles

Toward $hbox{YBa}_{2}hbox{Cu}_{3}hbox{O}_{7-delta}$ Nanoscale Structures for Hybrid Devices

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Terahertz Direct Detection in ${hbox{YBa}}_{2}{hbox{Cu}}_{3}{hbox{O}}_{7}$ Microbolometers

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Extensive Nanotwinning: Origin of High Current Density to High Fields in Preform-Optimized Infiltration-Growth-Processed $hbox{YBa}_{2}hbox{Cu}_{3}hbox{O}_{7 - delta}$ Superconductor

Fabrication of Thick $hbox{YBa}_{2}hbox{Cu}_{3}hbox{O}_{7-{rm x}}$ Films on Optimized $hbox{SrTiO}_{3}$ Buffered-MgO Single Crystals

Water-Vapor-Controlled Reaction for Fabrication of YBCO Films by Fluorine-Free Sol-Gel Process

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