Fabrication of the YBCO Films Made by TFA-MOD Using the 211-Process

Author

Lim, Jun Hyung ; Jang, Seok Hern ; Kim, Kyu Tae ; Lee, Seung Yi ; Lee, Chang Min ; Hwang, Soo Min ; Joo, Jinho ; Jung, Seung-Boo ; Nah, Wan-Soo

Author_Institution

Sungkyunkwan Univ., Suwon

Volume

17

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

3302

Lastpage

3305

Abstract

YBCO films were fabricated using TFA-MOD method with a precursor solution of and powders dissolved in trifluoroacetic acid (TFA) (the so called "211-film"). The effect of the calcining temperature on the phase formation, texture evolution, and thermal and critical properties were investigated. The microstructure and critical current density of the 211-film varied significantly with the calcining temperature. The highest of 1.9 (corresponding critical current is 39 A/cm-width) was obtained for the film calcined at 460, which is probably due to the enhanced degree of texture and increased film density and grain size. In addition, the microstructure and properties of the 211-films were compared with those of the film made using the conventional TFA-MOD method with the precursor of the acetates being dissolved in TFA. The of the 211-film was higher than that produced by the conventional TFA-MOD method. TG, DTA, pole-figure, and SEM analyses indicated that the higher was due to the improved microstructure resulting from the enhanced reaction kinetics in the 211-film.

Keywords

barium compounds; calcination; critical current density (superconductivity); differential thermal analysis; grain size; high-temperature superconductors; liquid phase deposition; scanning electron microscopy; superconducting thin films; texture; thermal properties; yttrium compounds; DTA analysis; SEM; TFA-MOD; TG analysis; YBCO films; YBa₂Cu₃O₇; calcining temperature; critical current density; grain size; metal organic deposition; microstructure; reaction kinetics; temperature 460 C; texture evolution; thermal properties; trifluoroacetic acid; Calcination; Critical current; Critical current density; Fabrication; Grain size; Kinetic theory; Microstructure; Powders; Temperature; Yttrium barium copper oxide; 211-process; Metal organic deposition; YBCO coated conductor; pole figure; trifluoroacetic acid;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2007.899115

Filename

4278178