Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Total pressure dependence of YBCO films in MOD method

MOD 공정에 의해 제조된 YBCO 박막의 압력 의존성

  • 유재무 (한국기계연구원 신기능재료연구본부) ;
  • 정국채 (한국기계연구원 신기능재료연구본부) ;
  • 고재웅 (한국기계연구원 신기능재료연구본부) ;
  • 김영국 (한국기계연구원 신기능재료연구본부) ;
  • ;
  • Published : 2006.03.01
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Abstract

The growth properties of MOD-YBCO films were investigated. To enhance the growth rate of YBCO layer and inhibit the build-up of HF gas during the annealing process in TFA-MOD for YBCO coated conductors the method of low pressure annealing was employed. Total pressure was changed from 700Torr to 1Torr and its effect on growth of YBCO films was compared with atmospheric one. The lower Pressure was effective to control of the pore size in MOD method . Surface morphology of YBCO films processed at low total pres sure was rough and composed of random YBCO (103) grains. But large pores, usually observed at atmospheric process in MOD disappeared and also the number of pores was reduced at low pressure annealing. Also discussed ate the effects of Fluorine-free Y and Cu precursor solution on the development of microstructure. Dense surface me phology and with less and small pores can be provided through controlling Fluorine content.

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References

  1. T. Araki. T. Yuasa, H. Kurosaki, Y. Yamada, I. Hirabayashi. T. Kato, T. Hirayama, T. Iijima. and T. Saito, "High-Jc $YBa_2Cu_3O_{7-X}$ films on metal tapes by the met.alorganic deposition method using trifluoroacetates", Supercond. Sci. Technol. 15 L1-L3, 2002 https://doi.org/10.1088/0953-2048/15/1/301
  2. Y. Aoki , R. Teranishi, Y. Kitoh, H. Fuji, K. Nakaoka, T. Koyama, Junko S. Matuda, T. Izumi, Y. Shiohara, Y. Tokunaga, Y. Yamada, T. Goto, A. Yaiima. "Fabrication of 10-m class Y-123 coated conductors using continuous reel-to-reel process by TFA-MOD method", Physica C 426-431, 945-948, 2005 https://doi.org/10.1016/j.physc.2005.03.076
  3. H. Fuji, R. Teranishi, Y. Kito, J. Matsuda, K. Nakaoka, T. Izumi, Y. Shiohara. Y. Yamada, A. Yajima, T. Saitoh, "Progress on TFA-MOD coated conductor development", Physica C 426-431, 938-944, 2005 https://doi.org/10.1016/j.physc.2005.02.153
  4. T. Honjo, Y. Nakamura, R. Teranishi, H. Fuji, J. Shibata, T. Izumi, and Y. Shiohara, "Growth mechanism of YBCO films in Metal organic deposition method using trifluoroacet.ates", IEEE Trans. on Applied Superconductivity, VOL 13, No.2, JUNE 2003
  5. R. Teranishi, T. Honjo, Y. Tokunaga, H. Fuji, J. Matsuda. T. Izumi, A. Yajima, and Y. Shiogara, "Fabrication of YBCO film by TFA-MOD process at low-pressure atmosphere", Physica C 412-414, 920-925, 2004 https://doi.org/10.1016/j.physc.2004.01.117
  6. J. Yoo, K. Leonard, H. Hsu, L. Heatherly, F. List, D. Lee, A. Gapud, P. Martin, S. Cook, M. Paranthanam, A. Goyal, and D. Kroeger, "The growth of YBCO films with high critical current at reduced pressures using the $BaF_2$ ex situ process", Supercond. Sci. Technol. 17, 1209-1214, 2004 https://doi.org/10.1088/0953-2048/17/10/023
  7. Y. Tokunaga, T. Honjo, T. Izumi, Y. Shiohara, Y. Iijima, T. Saitoh. T. Goto, A. Yoshinaka. A. Yajima , Cryogenics 44(2004) 817 https://doi.org/10.1016/j.cryogenics.2004.04.010
  8. M. Yoshizumi, I. Seleznev, and M. Cima, "Crystal growth of YBCO coated condcutor under low pressure", DOE wire workshop, Jan. 2003