Back to Search Start Over

High-J c YBCO films using precursors with barium concentration gradient in film thickness by TFA-MOD process

Authors :
Teranishi, R.
Tada, K.
Yoshida, J.
Yamada, K.
Mori, N.
Mukaida, M.
Inoue, M.
Kiss, T.
Nakaoka, K.
Miura, M.
Yoshizumi, M.
Izumi, T.
Shiohara, Y.
Source :
Physica C. Oct2009, Vol. 469 Issue 15-20, p1345-1348. 4p.
Publication Year :
2009

Abstract

Abstract: YBa2Cu3O7− δ (YBCO) films were grown by using precursor films with barium concentration gradient in film thickness by an advanced metal organic deposition process using trifluoroacetates (TFA-MOD). We have reported previously that a lot of non-reacted particles such as Y- and Cu-oxides were remained for the YBCO film surface grown by the precursors using a starting solution with barium-poor (cation ratio as Y:Ba:Cu=1:1.5:3). Then, the barium concentration was increased in the film surface to complete the reaction among these Y and Cu residues and Ba and to increase the Y123 growth thickness for realizing higher J c performance. Transmission electron microscopy (TEM) observation showed the increase of film thickness of YBCO grown by the precursors with barium concentration gradient in film thickness, indicating that the reaction between these Y and Cu-oxides and Ba proceeded to form Y123 phase. Consequently, higher J c was obtained for the YBCO film by the precursors mentioned above than that of the YBCO film by the precursors with a constant concentration. Effects of barium concentration gradient in the precursors on the superconducting properties and microstructures in the YBCO film were discussed. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
09214534
Volume :
469
Issue :
15-20
Database :
Academic Search Index
Journal :
Physica C
Publication Type :
Academic Journal
Accession number :
43808876
Full Text :
https://doi.org/10.1016/j.physc.2009.05.027