• Title/Summary/Keyword: $Bi_2Sr_2CaCu_2O_y$

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The application of hydrated fine MgO particles for flux pinning center in the HTS-BSCCO system

  • 김성환;김철진;정준기;박성창;유재무
    • Progress in Superconductivity
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    • v.3 no.2
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    • pp.188-192
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    • 2002

  • To introduce flux pinning center in HTS-BSCCO system, nano-size MgO particles were uniformly distributed within the Bi-2223 grain by partial hydration of MgO. The existing method MgO doped Bi-2223 used nato-size MgO powders, which resulted in agglomeration during mixing or grain growth during heat-treatment due to the high surface energy of the fine particles. By hydration of the MgO surface, the agglomeration of the MgO powders was avoided and the size of remaining MgO core was controlled by changing hydration medium and time. The thin film obtained by spin coating of (Bi_$1.8/Pb_{0.4}$)$Sr_2$$_{Ca}$$2.2/Cu_3$ $O_{y}$ nitrate solution mixed with hydrated MgO showed the even distribution of nano-size MgO particles in the Bi-2212 grains.s.s.

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Annealing Characteristic of Bi-2212 thick Films on Y2l1 substrate (Y211 기판 위의 Bi-2212 후막의 후열처리 특성)

  • Kang, Hyeong-Gon;Lim, Sung-Hun;Chong, Dong-Chul;Lim, Sung-Woo;Han, Byoung-Sung
    • 한국초전도학회:학술대회논문집
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    • v.9
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    • pp.296-299
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    • 1999

  • Bi$_2Sr_2CaCu_2O$(Bi-2212) thick films were fabricated on Y2l1 substrate by screen printing method. And the samples were annealed in various atmospheres, respectively. Though samples had many voids, the sample annealed in N$_2$ ; O$_2$ = 1:0 atmosphere and the sample in N$_2$ : O$_2$ = 0:1 showed some Bi 2212 low phase in comparison to other samples. The thickness of Bi-2212 on Y2ll substrates was about 20 ${\mu}$m.

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