Superconductivity of YBa2Cu3-yAgyO7-x Manufactured by Pyrophoric Synthetic Method

발화합성법으로 제조한 YBa2Cu3-yAgyO7-x의 초전도 특성

  • 김영순 (전북대학교 공과대학 화학공학과) ;
  • 양석우 (전북대학교 공과대학 화학공학과) ;
  • 박정식 (한려산업대학교 석유화학공학과) ;
  • 신형식 (전북대학교 공과대학 화학공학과)
  • Received : 1996.01.08
  • Accepted : 1996.06.21
  • Published : 1996.08.10

Abstract

The $YBa_2Cu_{3-y}Ag_yO_{7-x}$ high-temperature superconductors were prepared by pyrophoric synthetic method from $Y_2O_3$, $BaCO_3$, CuO, and $AgNO_3$ powders. When we were partially substituted Ag for Cu in $YBa_3Cu_3O_{7-x}$, the superconducting properties of $YBa_2Cu_{3-y}Ag_yO_{7-x}$ were investigated with X-ray diffractometer, resisitivity measuring equipment, SEM, and Vickers Hardness. The Tc,zero of $YBa_2Cu_3O_{7-x}$ was 91K, the density was $5.2g/cm^3$, and the hardness was $590kg/mm^2$. When Ag was substituted below y=0.15, electrical property of $YBa_2Cu_{3-y}Ag_yO_{7-x}$ did not change but microstructure, density, and hardness were enhanced.

원료물질인 $Y_2O_3$, $BaCO_3$, CuO 및 $AgNO_3$ 분말로부터 Y계 고온초전도체를 발화합성법으로 제조하였다 $YBa_2Cu_3O_{7-x}$와 Cu를 Ag로 부분 치환한 $YBa_2Cu_{3-y}Ag_yO_{7-x}$의 특성을 X-ray diffractometer, resistivity measuring equipment, SEM, and Vickers Hardness 등으로 분석하였다. $YBa_2Cu_3O_{7-x}$의 Tc,zero는 91K였고, 밀도는 $5.2g/cm^3$, 경도는 $590kg/mm^2$였다. Cu를 Ag로 0.15몰 이하 부분 치환한 $YBa_2Cu_{3-y}Ag_yO_{7-x}$의 경우 임계온도(Tc)는 거의 변하지 않으면서 미세구조, 밀도 및 경도가 향상되었다.

Keywords

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