Effects of heating rate in calcination process on microstructures of Y123 precursor and final films formed by advanced TFA-MOD method

Author

Matsuda, Junko S. ; Nakaoka, Koichi ; Tokunaga, Yoshitaka ; Teranishi, Ryo ; Koyama, Satoshi ; Aoki, Yuji ; Fuji, Hiroshi ; Yajima, Akimasa ; Yamada, Yutaka ; Izumi, Teruo ; Shiohara, Yuh

Author_Institution

Supercond. Res. Lab., Tokyo, Japan

Volume

15

Issue

2

fYear

2005

fDate

6/1/2005 12:00:00 AM

Firstpage

2652

Lastpage

2655

Abstract

We have investigated the effects of heating rates in the calcination process on microstructures of Y123 precursor and final films. As a result, it was found that there is CuO segregation in the vicinity of the Y123 precursor film surface, when the precursor is prepared at a rapid heating rate in the calcination. In the case of heat-treating this precursor film in the crystallization process, many large pores and misoriented Y123 crystals tend to remain in the Y123 final film. It is important to control the heating rate in the calcination, in order to attain higher J_C of the Y123 final films.

Keywords

barium compounds; calcination; critical current density (superconductivity); crystal microstructure; crystallisation; high-temperature superconductors; superconducting thin films; yttrium compounds; CuO segregation; Y123 crystal; Y123 precursor film surface; YBa₂Cu₃O₇; advanced TFA-MOD Method; calcination process; crystallization process; film microstructure; heating rate; metal organic deposition; superconducting tape; transmission electron microscopy; Calcination; Coatings; Crystallization; Heating; Laboratories; Microstructure; Substrates; Superconducting films; Superconductivity; Transmission electron microscopy; Metal organic deposition; superconducting tapes; transmission electron microscopy; yttrium compounds;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2005.847759

Filename

1440212