Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of the Ag Additive on the ${Bi_{1.84}}{Pb_{0.34}}{Sr_{1.91}}{Ca_{2.03}}{Cu_{3.06}}{O_{10+\delta}}$(110K Phase) High-$T_{c}$ Susperconductor

${Bi_{1.84}}{Pb_{0.34}}{Sr_{1.91}}{Ca_{2.03}}{Cu_{3.06}}{O_{10+\delta}}$(110K 상) 산화물 고온초전도체에 미치는 Ag 혼합효과

  • 이민수 (한밭대학교 두뇌한국 21사업단) ;
  • 최봉수 (한밭대학교 정보통신공학부) ;
  • 최봉수 (한남대학교 이과대학 광·전자물리학과)
  • Published : 2001.12.01
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Abstract

Samples with the nominal composition, B $i_{1.84}$P $b_{0.34}$S $r_{1.91}$C $a_{2.03}$C $u_{3.06}$ $O_{10+}$$\delta$/ high $T_{c}$ superconductors containing As as an additive were fabricated by a solid-state reaction method. Samples with Ag of 10wt%, 30 wt% and 50 wt% each were sintered at 86$0^{\circ}C$~875$^{\circ}C$ for 24 hours. The structural characteristics, critical temperature and grain size with respect to Ag contents were analyzed by XRD(X-ray Diffraction) and SEM(Scanning Electron Microscope), respectively. As Ag contents increased, XRD peaks of g in Bi-2223 phase superconductors intensified and the proportion of the phase transition from Bi-2223 to Bi-2212 was increased.increased.

110K상의 산화물 고온초전도체를 B $i_{1.84}$P $b_{0.34}$S $r_{1.91}$C $a_{2.03}$C $u_{3.06}$ $O_{10+}$$\delta$/의 출발조성비로 고상반응법(solid-state reaction)에 의해 합성하였다. 이렇게 합성된 Bi계 110K상의 산화물 고온초전도 물질을 다시 분말 상태로 만든 후, Ag 금속분말을 10wt%, 30wt%, 50wt%의 각 비율로 혼합하였다. Ag 금속분말이 혼합된 시편들을 86$0^{\circ}C$~875$^{\circ}C$로 24시간 동안 최종 소결시켰다. 그후, 각 시편들에 대하여 x-선, $T_{c}$, SEM 등을 측정하여 Ag 혼합량에 대한 초전도특성 및 표면의 grain 크기변화 등에 대한 조사를 진행하였다. Ag 혼합량이 증가됨에 따라 Ag peak의 강도는 증가되었고, 시편 내 2223 상의 비율은 감소하고 2212상의 비율은 증가되었다.비율은 증가되었다.

Keywords

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