High performance of YBCO coated conductors using advanced TFA-MOD method

Yoshitaka Tokunaga, Junko Matsuda, Ryo Teranishi, Hiroshi Fuji, Tetsuji Honjo, Teruo Izumi, Yuh Shiohara, Akimasa Yajima

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In order to shorten the calcination time in the metal-organic deposition (MOD) process using metal trifuluoroacetete (TFA), a new combination of starting materials was developed using F-free salt of Cu and TFA salts of Y and Ba as called "New solution". Moreover, a new process temperature profile for this solution was developed as an advanced TFA-MOD process where the high heating rate was achieved. Consequently, the overall transport Ic value of 210 A and the 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 degree of in-plane alignment δφ of the buffer layer and PH2O in the annealing process for the Jc characteristics were investigated. As a result, a YBCO film with 1.48 μm in thickness was fabricated on a CeO2/IBAD-Gd 2Zr2O7 layer buffered Hastelloy substrate with δφ = 4.7°. The overall Ic value of 292 A (77 K Self-field) corresponding to the Jc value of 2.0 MA/cm2 was achieved. Moreover, the overall Jc value of 2.1 MA/cm2 (77 K Self-field) for the YBCO film with 1.2 μm thickness was achieved by annealing under the P H2O value of 13.5 vol% on a similar metal substrate even with δφ∼7°.

Original languageEnglish
Pages (from-to)742-747
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume68
Issue number9
DOIs
Publication statusPublished - Jan 1 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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