Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지
DOI QR코드

DOI QR Code

Fabrication of TFA-MOD YBCO Films Using Y2Ba1Cu1Ox Process

Y2Ba1Cu1Ox공정을 이용한 TFA-MOC YBCO 박막 공정 개발

  • Lim, Jun-Hyung (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Jang, Seok-Hern (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Kim, Kyu-Tae (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Lee, Jin-Sung (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Yoon, Kyung-Min (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Ha, Hong-Soo (School of Advanced Materials Science and Engineering, Sungkyunkwan University, Korea Eletrotechnology Research Institute) ;
  • Joo, Jinho (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Nah, Wansoo (School of Electrical and Computer Engineering, Sungkyunkwan University)
  • 임준형 (성균관대학교 신소재공학부) ;
  • 장석헌 (성균관대학교 신소재공학부) ;
  • 김규태 (성균관대학교 신소재공학부) ;
  • 이진성 (성균관대학교 신소재공학부) ;
  • 윤경민 (성균관대학교 신소재공학부) ;
  • 하홍수 (성균관대학교 신소재공학부, 한국전기연구원) ;
  • 주진호 (성균관대학교 신소재공학부) ;
  • 나완수 (성균관대학교 정보통신공학부)
  • Published : 2006.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

YBCO film was synthesized by using a new approach to the TFA-MOD method. In the fabrication process, $Y_2Ba_1Cu_1O_x\;and\;Ba_3Cu_5O_8$ powders were used as precursors (the so called '211 process'), instead of Y-, Ba-, and Cu-based acetates, and dissolved in trifluoroacetic acid followed by calcining and firing heat treatment. Consequently, we successfully fabricated YBCO film and evaluated the phase formation, texture evolution, and critical properties as a function of the calcining and firing temperature and humidity, in order to explore its possible application in coated conductor fabrication. The films were calcined at $430-460^{\circ}C$ and then fired at $750-800^{\circ}C\;in\;a\;0-20\%$ humidified $Ar-O_2$ atmosphere. We observed that $BaF_2$ phase was effectively reduced and that a sharp and strong biaxial texture formed under humidified atmosphere leading to increased critical properties. In addition, we found that the microstructure varied significantly with the firing temperature: the grain grew further, the film became denser, and the degree of texture and phase purity varied as the firing temperature increased. For the film fired at $775^{\circ}C$ after calcining at $460^{\circ}C$, the critical current was obtained to be 39 A/cm-width (corresponding critical current density is $2.0\;MA/cm^2$ which was probably attributed to such factors as the enhanced phase purity and out-of-plane texture, the moderate film density and grain size, and crack-free surface.

Keywords

References

  1. P. C. Mclntyre, M. J. Cima, and A. Roshko, 'Epitaxial Nucleation and Growth of Chemically Derived $Ba_2YCu_3O_{7-x}$ Thin Films on (001) $SrTiO_3$,' J. Appl. Phys., 77 5263-72 (1995) https://doi.org/10.1063/1.359278
  2. R. Freestra, T. B. Lindemer, J. D. Budai, and M. D. Galloway, 'Effect of Oxygen Pressure on the Synthesis of $YBa_2Cu_3O_{7-x}$ Thin Films by Post-Deposition Annealing,' J. Appl. Phys., 69 6569-85 (1991) https://doi.org/10.1063/1.348868
  3. H. Yamane, T. Hirai, K. Watanabe, N. Kobayashi, Y. Muto, M. Hasei, and H. Kurosawa, 'Preparation of a High-Jc YBa- Cu-O Film at $700^{\circ}C$ by Thermal Chemical Vapor Deposition,' J. Appl. Phys., 69 7948-50 (1991) https://doi.org/10.1063/1.347491
  4. A. Gupta, R. Jagannathan, E. I. Cooper, E. A. Giess, J. I. Landman, and B. W. Hussey, 'Superconducting Oxide Films with High Transition Temperature Prepared from Metal Trifluoroacetate Precursors,' Appl. Phys. Lett., 52 2077-79 (1988) https://doi.org/10.1063/1.99752
  5. T. Izumi, Y. Tokunaga, H. Fuji, R. Teranishi, J. Matsuda, S. Asada, T. Honjo, Y. Shiohara, T. Muroga, S. Miyata, T. Watanabe, Y. Yamada, Y. Iijima, T. Saitoh, T. Goto, A. Yoshinaka, and A. Yajima, 'Progress in Development of Coated Conductors by TFA-MOD Processing,' Physica C, 412-414 885-89 (2004)
  6. T. L. Aselage, 'Occurence of Free CuO in $YBa_2Cu_3O_{6+\delta}$ and Its Effect on Melting and Solidification,' Physica C, 233 292-300 (1994) https://doi.org/10.1016/0921-4534(94)90755-2
  7. P. C. Mclntyre, M. J. Cima, J. A. Smith Jr., R. B. Hallock, M. P. Siegal, and J. M. Phillips, 'Effect of Growth Conditions on the Properties and Morphology of Chemically Derived Epitaxial Thin Films of $Ba_2YCu_3O_{7-x}$ on (001) $LaAlO_3$,' J. Appl. Phys., 71 1868-77 (1992) https://doi.org/10.1063/1.351172
  8. Y.-A. Jee, B. Ma, V. A. Maroni, M. Li, B. L. Fisher, and U. Balachandran, 'Texture Development and Superconducting Properties of $YBa_2Cu_3O_x$ Thin Films Prepared by a Solution Process in Low Oxygen Partial Pressure,' Supercond. Sci. Technol., 14 285-91 (2001) https://doi.org/10.1088/0953-2048/14/5/308
  9. T. Izumi, T. Honjo, Y. Tokunaga, H. Fuji, R. Teranishi, Y. Iijima, T. Saitoh, Y. Nakamura, and Y. Shiohara, 'High-Ic YBCO Coated Conductors by Metal Organic Deposition Method Using Trifluoroacetates,' IEEE Trans. on Appl. Supercond., 13 2, 2500-03 (2003) https://doi.org/10.1109/TASC.2003.811831
  10. T. Araki, K. Yamagiwa, and I. Hirabayashi, 'Fabrication of $YBa_2Cu_3O_{7-x}$ Film by Metalorganic Deposition Method Using Trifluoroacetates and Its Process Conditions,' Cryogenics, 41 675-81 (2001) https://doi.org/10.1016/S0011-2275(01)00148-5
  11. R. K. Singh and J. Narayan, 'Nature of Epitaxial Growth of High-Tc Laser-Deposited Y-Ba-Cu-O Films on (100) Strontium Titanate Substrates,' J. Appl. Phys., 67 3785-90 (1990) https://doi.org/10.1063/1.345024