TY - JOUR
T1 - Effect of F/Ba ratio of precursor solution on the properties of solution-processed YBCO superconducting films
AU - Bian, Weibai
AU - Chen, Yuanqing
AU - Huang, Wenhuang
AU - Zhao, Gaoyang
AU - Nishii, Junji
AU - Kaiju, Hideo
AU - Fujioka, Masaya
AU - Li, Lingwei
AU - Li, Na
AU - Yan, Fuxue
N1 - Publisher Copyright:
© 2017 Elsevier Ltd and Techna Group S.r.l.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/8/1
Y1 - 2017/8/1
N2 - YBa2Cu3O7−x (YBCO) thin films (with thickness of 220–230 nm) and thick films (with thickness of 1.1–1.2 µm) were prepared using low fluorine solutions with different F/Ba ratios (F/Ba=1–4.5). The effect of F/Ba ratio on the properties of the films was systematically investigated. The results showed that films derived from solutions with F/Ba<2, regardless of whether they were thin or thick, showed poor superconductivity due to the formation of BaCO3 intermediate phase. When solutions with F/Ba≥2 were used, the superconductivity of as-prepared YBCO films was related to not only the film thickness, but also the F/Ba ratio in the solution. It was found that, for thick films derived from F/Ba>2 solutions, the formation of BaF2/BaOF phase was retarded by the decomposition of Ba1−xYxF2+x (BYF) intermediate phase. We also found that extra fluorine in the solution resulted in a large number of impurities and a-axis grains in the thick films, degrading the film superconductivity. F/Ba=2 was the optimal ratio in the solution to fabricate high-Jc YBCO thick films.
AB - YBa2Cu3O7−x (YBCO) thin films (with thickness of 220–230 nm) and thick films (with thickness of 1.1–1.2 µm) were prepared using low fluorine solutions with different F/Ba ratios (F/Ba=1–4.5). The effect of F/Ba ratio on the properties of the films was systematically investigated. The results showed that films derived from solutions with F/Ba<2, regardless of whether they were thin or thick, showed poor superconductivity due to the formation of BaCO3 intermediate phase. When solutions with F/Ba≥2 were used, the superconductivity of as-prepared YBCO films was related to not only the film thickness, but also the F/Ba ratio in the solution. It was found that, for thick films derived from F/Ba>2 solutions, the formation of BaF2/BaOF phase was retarded by the decomposition of Ba1−xYxF2+x (BYF) intermediate phase. We also found that extra fluorine in the solution resulted in a large number of impurities and a-axis grains in the thick films, degrading the film superconductivity. F/Ba=2 was the optimal ratio in the solution to fabricate high-Jc YBCO thick films.
KW - Films
KW - Low-fluorine solution
KW - Superconductivity
KW - YBaCuO
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U2 - 10.1016/j.ceramint.2017.03.193
DO - 10.1016/j.ceramint.2017.03.193
M3 - Article
AN - SCOPUS:85016473314
VL - 43
SP - 8433
EP - 8439
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 11
ER -