한국초전도학회:학술대회논문집

The Korean Superconductivity Society (한국초전도학회)
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The mechanism of Bi$_{0.5}Pb_3Sr_2Ca_2CuO_{\delta}$ and (Ca,Sr)$_2$(BiPb)O$_4$ phase as a flux-pinning center in (Bi,Pb)$_2Sr_2Ca_2CuO_{10}$ superconductor

(Bi,Pb)$_2Sr_2Ca_2CuO_{10}$ 초전도체에l서 flux-pinning center로서 Bi$_{0.5}Pb_3Sr_2Ca_2CuO_{\delta}$ 및 (Ca,Sr)$_2$(BiPb)O$_4$ 상의도입 기구

  • Chung, Jun-Ki (Dept. of Inorganic Materials Eng., Research Institute of Industrial technology, Gyeongsang National University) ;
  • Kim, Cheol-Jin (Dept. of Inorganic Materials Eng., Research Institute of Industrial technology, Gyeongsang National University) ;
  • Lee, Sang-Hee (Dept. of Inorganic Materials Eng., Research Institute of Industrial technology, Gyeongsang National University) ;
  • Yoo, Jae-Moo (Korea Institute of Machinery & Metals) ;
  • Kim, Hae-Doo (Korea Institute of Machinery & Metals) ;
  • Koh, Jae-Woong (Korea Institute of Machinery & Metals)
  • Published : 1999.08.18
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Abstract

To tap the feasibility of exploiting the 2$^{nd}$ phases as flux-pinning centers in the (Bi,Pb)$_2Sr_2Ca_2CuO_{10}$ superconductor, the size and the distribution of the precipitates have been controlled by changing reaction temperature and time, oxygen partial pressure Po$_2$ and annealing condition. Various annealing heat treatments were also conducted on the as-received 61 filament Bi-2223 tapes with Bi$_{1.8}Pb_{0.4}Sr_2Ca_{2.2}Cu_3O_8$ starting composition and annealed specimen were analyzed with XRD, SEM, EDS and TEM.. The grain size of (Ca,Sr)$_2$(BiPb)O$_4$ or Bi$_{0.5}Pb_3Sr_2Ca_2CuO_{\delta}$ was controllable by optimizing the heat treatment condition and critical current density (J$_c$) showed dependence on the size of the 2$^{nd}$ phases.

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