Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Fabrication of high-$J_c$ $YBa_2Cu_3O_{7-{\delta}}$ thin films on (100) $SrTiO_3$ single crystal substrates by a modified TFA-MOD method

수정된 TFA-MOD법에 의한 (100) $SrTiO_3$ 단결정 기판 위 고 임계전류 밀도 $YBa_2Cu_3O_{7-{\delta}}$ 박막 제조

  • 위성훈 (서울대 재료공학부) ;
  • 신거명 (서울대 재료공학부) ;
  • 송규정 (한국전기연구원 초전도재료연구그룹) ;
  • 홍계원 (한국산업기술대학교 에너지대학원) ;
  • 문승현 (서울대학교 재료공학부) ;
  • 박찬 (한국전기연구원 초전도재료연구그룹) ;
  • 유상임 (서울대학교 재료공학과)
  • Published : 2004.03.01
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Abstract

High critical current density. $J_c$ over $1MA/cm^2$ at 77 K in a self field was successfully achieved from the YBCO film prepared on (100) $SrTiO_3$ single-crystal substrates by the TFA-MOD process. Unlike a normal TFA-MOD process, we prepared the TFA precursor solution by dissolving YBCO powder into the trifluoroacetic acid. A significant amount of the second phases, including $BaF_2$, was observed in the films fired at $700-725^{\circ}C$ for 2 h under $P(O_2)=10^{-3}$ atm and $P(H_2O)=4.2%$, most probably due to an insufficient reaction time, and hence $T_c$ was greatly degraded. However the films fired at $750-800^{\circ}C$ for 2 h were composed of strongly c-axis oriented YBCO grams without any second phases. and exhibited the $T_c$ values of 89.5 ~ 91 K with a sharp transition. With increasing the firing temperature from 750 to $800^{\circ}C$ average grain size of YBCO was increased and grain connectivity was enhanced. The highest $J_c$ value of $1.1MA/cm^2$ was obtained from the YBCO film fired at $800^{\circ}C$.

Keywords

References

  1. Physica C v.384 Influence of the low partial pressures on thick YBCO coated conductor by sol-gel process Z.Aslanoglu;Y.Akin;M.O.Kwani;W.Sigmund;Y.Hascic https://doi.org/10.1016/S0921-4534(02)02061-0
  2. Physica C v.386 Effect of precursor stoichiometry on the superconducting properties of fluorine-free sol-gel YBCO thin film B.Zhao;H.B.Yao;Z.H.Han;Y.L.Xu;D.L.Shi https://doi.org/10.1016/S0921-4534(02)02196-2
  3. Appl. Phys. Lett. v.52 Superconucting oxide films with high transition temperature prepared from metal trifluoroacetate precursors A.Gupta;R.Jagannathan;E.I.Cooper;E.A.Giess;J.I.Landman;B.W.Hussey https://doi.org/10.1063/1.99752
  4. J.Appl. Phys. v.68 Metalorganic deposition of high-Jc$Ba_2YCu_3O_7-x$ thin films from trifluacetate precursors onto (100)SrTiO₃ PaulC.Mclntyre;MichaelJ.Cima;ManfaiNg https://doi.org/10.1063/1.346233
  5. J.Appl. Phys. v.71 Efect of gown conditions on the properties and morphologyof chemically derived epitaxial thin film of $Ba_2YCu_3O_7-x$ thin films on (001) LaAlO₃ PaulC.Mclntyre;mICHAEL;j.Cima;JohnA.Smith;Jr.;RoerB.Hallock https://doi.org/10.1063/1.351172
  6. IEEE Trans. Appl. Supercond. v.11 Application o solution deposition to fabricate Y-Ba-Cu-O coated conductor S. Sathyamurthy;K.Salama https://doi.org/10.1109/77.919677
  7. IEEE Trans. Appl. Supercond. v.11 Thick sol-gel Derived $Ba_2Cu_3O_7-x$ films J.T.Dawley;P.G.Clem;M.P.Siegal;D.L.Overmyer;M.A.Rodriuez https://doi.org/10.1109/77.919662
  8. Physica C Firing condition for enire reaction of fluories with water vapor in metalorganic deposition method using trifluoroacetate T.Araki;Y.Takahashi;K.Yamagiwa;Y.Iijima;K.Takeda;Y.Yamada;J.Shibata;T.Hirayama;I.Hirabayashi
  9. Physica C Progress in solution-based YBCO coated conductor Q.Li.W.Zhang;U.Schoop;M.W.Rupich;S.Annavarapu;D.T.Verebelyi;C.L.H.Thieme;V.Prunier;X.Cui;M.D.Teplitsky;L.G.Fritzemeier;G.N.RileyJr.;M.Paranthaman;A.GoyalG.F.Lee;T.G.Holesinger
  10. Supercond.Sci.Technol v.14 Texture development and superconducting properties of $YBa_2Cu_3O_x$ thin films prepared by a solution process in low oxygen partial pressure Y.A.Jee;.Ma.V.A.Maroni;M.Li.B.L.Fisher;U.Balachandran https://doi.org/10.1088/0953-2048/14/5/308
  11. IEEE Trans. Appl. Supercond. v.9 High Critical Density Thick MOD-Dervied YBCO Films J.A.Smith;M.J.Cima;N.Sonnenberg https://doi.org/10.1109/77.784685
  12. IEEE Trans. Appl. Supercond. v.11 Fabrication of $YBa_2Cu_3O_7-x$ Films on Bufered Metal Tapes Fired at Low Temperature by MOD Method using Trifluoroacetate Salts T.Araki;Y.Takahashi;K.Yamagiwa;T.Yuasa;Y.Iijima;K.Takeda;S.B.Kim;Y.Yamada;I.Hirabayashi https://doi.org/10.1109/77.919661
  13. Supercond.Sci.Technol. v.16 High quality thin films grown by trifluoroacetates metalorganic deposition O.Castano;A.Cavallaro;A.Palau;J.C.Gonzalez;M.Rossell;T.Puig;F.Sandiumenge;N.Mestres;S.Pinol;A.Pomar;X.Obradors https://doi.org/10.1088/0953-2048/16/1/309
  14. Physica C Microstructural observation of $YBa_2Cu_3O_7-x$ thin film prepared by TFA-MOD method T.Ono;K.Matsumoto;K.Osamura;I.Hirabayashi
  15. 6th European Conference on Applied Superconductivity Proceedings, (to be published YBCO ilms prepared by the TFA-MOD process using YBCO powder as the starting material S.H.Wee;W.J.Jung;H.G.Lee;C.J.Kim;G.W.Hong;K.J.Song;J.G.Ghung;C.Park;S.H.Moon;S.I.Yoo
  16. Physical Review B v.41 Structual properties of oxygen-deficient J.D.Jorgensen;B.W.Veal;A.P.Paulikas;L.J.Nowiki;G.W.Grabtree;H.Claus;W.K.Kwok https://doi.org/10.1103/PhysRevB.41.1863
  17. Mater. Sci. &Eng. v.R22 Pulsed laser deposition and characterization of high-Tc y superconducting thin films R.K.Singh;D.Kumar