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Development of YBCO film approached by TFA-MOD method using the Y2Ba1Cu1Ox and Ba3Cu5O8 powders

Published online by Cambridge University Press:  01 February 2011

Jun Hyung Lim
Affiliation:
lanosjh@hanmail.net, Sungkyunkwan University, School of advanced materials science and engineering, chunchun-dong, Jangan-gu, 300, suwon, N/A, 440-746, Korea, Republic of, 82-31-290-7385, 82-31-290-7371
Seok Hern Jang
Affiliation:
shjang@htcs.skku.ac.kr, Sungkyunkwan University, School of Advanced Materials Science and Engineering, 300 cheoncheon, Jangan, Suwon, Gyeonggi, 440-746, Korea, Republic of
Kyung Min Yoon
Affiliation:
km94380902@hotmail.com, Sungkyunkwan University, School of Advanced Materials Science and Engineering, 300 cheoncheon, Jangan, Suwon, Gyeonggi, 440-746, Korea, Republic of
Jinho Joo
Affiliation:
jinho@skku.ac.kr, Sungkyunkwan University, School of Advanced Materials Science and Engineering, 300 cheoncheon, Jangan, Suwon, Gyeonggi, 440-746, Korea, Republic of
Seung-Boo Jung
Affiliation:
sbjung@skku.ac.kr, Sungkyunkwan University, School of Advanced Materials Science and Engineering, 300 cheoncheon, Jangan, Suwon, Gyeonggi, 440-746, Korea, Republic of
Wansoo Nah
Affiliation:
wsnah@skku.ac.kr, Sungkyunkwan University, School of Electrical and computer Engineering, 300 cheoncheon, Jangan, Suwon, Gyeonggi, 440-746, Korea, Republic of
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Abstract

The YBCO films were fabricated by TFA-MOD method in route of ¡°211 process¡± and evaluated the phase formation, texture evolution, and critical properties as a function of the humidity firing process. In the fabrication process, Y2Ba1Cu1Ox and Ba3Cu5O8 powders, instead of Y-, Ba- and Cu-based acetates, were used as precursors. In order to evaluate the effect of humidity during the firing process, the films calcined at 430¡É were fired at 775¡É in dry Ar(0%), 4.2%, 8.0%, 12.1%, and 20.0% humidified Ar gas mixed with 1000 ppm oxygen.

We observed that the amount of BaF2 phase was effectively reduced and that a sharp and strong biaxial texture formed under a humidified atmosphere, leading to increased critical properties. The film became denser and the degree of texture and phase purity varied as the humidity increased. For the film fired in 0% humidity, the measured value of Tc(onset) was found to be 82.5 K, but the Tc(zero) could not be measured. When the humidity was increased to 4.2%, the corresponding Tc(onset) and Tc(zero) were increased to 91.5 K and 88.6 K, respectively. For the films in the humidity range of 12.1-20.0%, the critical current was found to be 30 A/cm-width (the corresponding critical current density is 1.54 MA/cm2).

Type
Research Article
Copyright
Copyright © Materials Research Society 2006

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References

1 Izumi, T., Tokunaga, Y., Fuji, H., Teranishi, R., Matsuda, J., Asada, S., Honjo, T., Shiohara, Y., Muroga, T., Miyata, S., Watanabe, T., Yamada, Y., Iijima, Y., Saitoh, T., Goto, T., Yoshinaka, A., Yajima, A., Physica C, 412–414, 885 (2004)CrossRefGoogle Scholar
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5 Izumi, T Honjo, T Tokunaga, Y Fuji, H Teranishi, R Iijima, Y Saitoh, T Nakamura, Y Shiohara, Y, “High-Ic YBCO coated conductors by metal organic deposition method using trifluoroacetates”, IEEE Trans. on applied supercond., 13, 2, 2500 (2003)CrossRefGoogle Scholar

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Development of YBCO film approached by TFA-MOD method using the Y2Ba1Cu1Ox and Ba3Cu5O8 powders
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