TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
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High-performance YBCO-coated Conductors Achieved by Optimizing Calcination Using an Advanced TFA-MOD Method
Yoshitaka TOKUNAGA, Ryo TERANISHI, Hiroshi FUJI, Junko MATSUDA, Tetsuji HONJO, Teruo IZUMI, Yuh SHIOHARA, Yutaka YAMADA, Tomotaka GOTO, Atsuya YOSHINAKA, Akimasa YAJIMA
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Keywords: metalorganic deposition, trifluoroacetate, critical current density, fluorine free (F-free) salt
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2004 Volume 39 Issue 11 Pages 518-522

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Abstract
In order to shorten the calcination time in the metal-organic deposition (MOD) process using metal trifluoroacetate (TFA), a new combination of starting materials was developed using the F-free salt of Cu and TFA salts of Y and Ba as a so-called "new solution". Moreover, a new process temperature profile for this solution was developed as an advanced TFA-MOD process in which a high heating rate was achieved. Consequently, an overall transport Ic value of 210 A and a Jc value of 1.5 MA/cm2 (77 K, Self-field), similar to Ic and Jc values using TFA for all salts, were obtained. In order to obtain higher Jc performance, the effects of process parameters such as the heating rate in the calcination process for the Jc characteristics were investigated. As a result, a YBCO film with a thickness of 1.2μm was fabricated on a CeO2/IBAD-Gd2Zr2O7 layer-buffered Hastelloy substrate with Δφ∼7°. The overall Ic value of 251 A (77 K Self-field) corresponding to the Jc value of 2.1 MA/cm2 was achieved by calcination at a heating rate of 2°C/min.
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© 2004 by Cryogenics and Superconductivity Society of Japan (Cryogenic Association of Japan)
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