Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Enhancement of critical current density in $BaCeO_3$ doped $YBa_2Cu_3O_{7-\delta}$ thin Films deposited by TFA-MOD process

TFA-MOD공정에서 $BaCeO_3$ 첨가에 의한 $YBa_2Cu_3O_{7-\delta}$ 박막의 임계전류밀도 증가

  • 이종범 (한국산업기술대학교 에너지대학원) ;
  • 김병주 (한국산업기술대학교 에너지대학원) ;
  • 이희균 (한국산업기술대학교 신소재공학과) ;
  • 홍계원 (한국산업기술대학교 에너지대학원)
  • Published : 2008.03.31
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Abstract

The effect of $BaCeO_3$ doping on the critical current density of YBCO film by TFA-MOD method was studied. $BaCeO_3$ doping was made by two method; one is direct addition of $BaCeO_3$ nano-sized powder prepared by citrate process followed by grinding with planetary ball mill for 10 hours. Another is addition of Ba-Ce precursor solution prepared with Ba-acetate and Ce acetate dissolved in TFA to the YBCO-TFA precursor solution. The film was made by standard dip coating and heat treatment process with conversion temperature of $790^{\circ}C$ in 1000 ppm oxygen containing moisturized Ar gas atmosphere. The direct addition of $BaCeO_3$ powder resulted in YBCO film with good epitaxial growth and no evidence of second phase formation. The addition through precursor solution resulted in the increase of critical current density upto 30 at% doping and uniform dispersion of $BaCeO_3$ fine inclusion was confirmed by SEM-EDX.

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References

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