• Title, Summary, Keyword: BiPbSrCaCuO superconductor

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Magnetic Suspension Effect of BiPbSrCaCuO Superconductor (Bi계 초전도체의 Magnetic Suspension)

  • 이상헌
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.101-103
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    • 2001
  • Suspension effect has been studied by using superconductor of BiPbSrCaCuO ceramics containing Ag$_2$O It has been cleared that Ag$_2$O acts as pinning center which plays an important role to the suspension effect. Magnetic repulsive force which affects a superconductor located in magnetic flux from toroidal magnet has been investigated. It has been concluded that the suspension effect arises from the interaction between the pinning effect and the diamagnetic effect.

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Electromagnetic Characteristics of BiPbSrCaCuO Superconductor (BiPbSrCaCuO계 초전도체의 전기자기적 특성)

  • Lee, Sang-Heon
    • Proceedings of the KIEE Conference
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    • pp.69-70
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    • 2002
  • Suspension effect has been studied by using superconductor of BiPbSrCaCuO ceramics containing $Ag_2O$. It has been cleared that $Ag_2O$ acts as pinning center which plays an important role to the suspension effect. Magnetic repulsive force which affects a superconductor located in magnetic flux from toroidal magnet has been investigated. It has been concluded that the suspension effect arises from the interaction between the pinning effect and the diamagnetic effect.

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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;Kim, Cheol-Jin;Lee, Sang-Hee;Yoo, Jae-Moo;Kim, Hae-Doo;Koh, Jae-Woong
    • 한국초전도학회:학술대회논문집
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    • v.9
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    • pp.300-304
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    • 1999
  • 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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Bi(Pb)SrCaCuO superconductor fabricated by interdiffusion of SrCaCuO and BiPbCuO double layers (SrCaCuO와 BiPbCuO 이중층의 상호확산에 의해 제조된 Bi(Pb)SrCaCuO 초전도체)

  • 최효상;이중근;정동철;한병성
    • Electrical & Electronic Materials
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    • v.9 no.7
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    • pp.680-689
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    • 1996
  • SrCaCuO와 BiPbCuO 화합물로 이루어진 이중층시료가 만들어 졌으며, 소결과정에서 나타나는 확산과 입자간의 상호작용으로 108K의 임계온도를 나타내었다. 이 시료는 820.deg. C에서 0-210 시간동안 소결되었다. 초전도체의 생성, 성장메카니즘과 임계온도의 관계가 연구되었으며, 최적조건은 820.deg. C에서 210시간 소결하고 SrCaCuO와 BiPbCuO의 도포비가 1:0.6인 시편에서 나타났다. 또한 이중층시료에서 가장 좋은 조성비는 S $r_{2}$C $a_{2}$C $u_{2}$ $O_{x}$와 B $i_{1.9}$P $b_{0.5}$C $u_{3}$ $O_{y}$ 이었다.다.

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Magnetic Suspension Effect of BiPbSrCaCuO Superconducting Bulk (BiPbSrCaCuO 초전도 벌크의 Magnetic Suspension)

  • 이상헌
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.5
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    • pp.545-551
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    • 2004
  • Magnetic suspension effect has been studied by using superconductor of BiPbSrCaCuO ceramics containing Ag$_2$O. Magnetic flux measurements of a toroidal magnet revealed a concave shaped field distribution with a null field along the axis of the torus at the point where the field reversed. The suspension effect was observed only for the Ag$_2$O doped and field cooled sample which is attributed to the enhanced flux pinning due to the field cooled condition. It has been cleared that Ag$_2$O acts as pinning center which plays an important role to the magnetic suspension effect. Magnetic repulsive force which affects a superconductor located in magnetic flux from toroidal magnet has been investigated. It has been concluded that the magnetic suspension effect arises from the interaction between the pinning effect and the diamagnetic effect.

Effect of Sb doppd in Bi-Pb-Sr-Ca-O Superconductor (Bi-(Pb)-Sr-Ca-Cu-O계 초전도체의 Sb 첨가 효과)

  • 한태희;김민기;최성환;최효상;황종선
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.64-69
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    • 1992
  • Bi-Sr-Ca-Cu-O superconducting system have the low and high Tc phases. In order to get the superconductor above crtitical temperature 100K, we added with Pb and sintered for a long time about 200 hrs. In this study, the influence of superconducting characteristics on the Bi(Pb)SrCaCuO system characteristics on the Bi(Pb)SrCaCuO system dopped Sb was investigate too. Adding Sb of 0.1 mol, the sintering time is short than that dopped Pb only. We could get the critical temperature 102 K at sintered for 24 hrs and 109 K for 210 hrs.

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Suspension Mechanism of BiPbSrCaCuO Superconductor (BiPbSrCaCuO 초전도체의 자기부양 메커니즘)

  • Lee, Sang-Heon;Lee, Young-Hie;Nam, Sung-Pil;Lee, Sung-Gap
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.90-92
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    • 2004
  • Suspension effect has been studied by using superconductor of BiPbSrCaCuO ceramics containing $Ag_2O$. It has been cleared that $Ag_2O$ acts as pinning center which plays an important role to the suspension effect. Magnetic repulsive force which affects a superconductor located in magnetic flux from toroidal magnet has been investigated. It has been concluded that the suspension effect arises from the interaction between the pinning effect and the diamagnetic effect.

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Fishing Effect of BiPbSrCaCuO Superconductor (BiPbSrCaCuO 초전도체의 Fishing 효과)

  • Lee, Sang-Heon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.177-179
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    • 2004
  • Suspension effect has been studied by using superconductor of BiPbSrCaCuO ceramics containing $Ag_2O$. It has been cleared that $Ag_2O$ acts as pinning center which plays an important role to the suspension effect. Magnetic repulsive force which affects a superconductor located in magnetic flux from toroidal magnet has been investigated. It has been concluded that the suspension effect arises from the interaction between the pinning effect and the diamagnetic effect.

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Electromagnetic Properties of BiPbSrCaCuO Superconductor (BiPbSrCaCuO 초전도체의 전자기특성)

  • 이상헌
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.7
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    • pp.788-792
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    • 2004
  • The Electromagnetic properties in BiPbSrCaCuO superconductor was studied. In the measurement of current-voltage characteristics, a voltage across the superconducting sample was observed on applying an external magnetic field. The voltage continues to appear the removal of the magnetic field. The appearance of the voltage is ascribed to the trapping of magnetic flux. Depanding on the direction of appied magnetic flux less than $2.5\times{10}^-5$ T, the voltage in the magnetized sample increases or decreases. It is considered that mechanism of voltage occurrence can be explained by applying filament model.

Tunneling Characteristics in $Pb/Bi_2Sr_2CaCu_2O_{8+\delta}$ Junctions as an Evidence for a d-wave Order Parameter Symmetry in $Bi_2Sr_2CaCu_2O_{8+\delta}$ Superconductors ($Bi_2Sr_2CaCu_2O_{8+\delta}$ 고온초전도체의 d-파 대칭성 증거로서의 $Pb/Bi_2Sr_2CaCu_2O_{8+\delta}$접합 투과전도특성)

  • Chang, Hyun-Sik;Lee, Hu-Jong
    • Progress in Superconductivity
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    • v.2 no.2
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    • pp.65-70
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    • 2001
  • Pb/B $i_2$S $r_2$CaC $u_2$ $O_{8+}$$\delta$/-single-crystal junctions with the tunneling direction along the c axis of the crystal were fabricated to obtain an s-wave-superconductor/d-wave-superconductor Josephson junctions. The tunneling R (T) curves and current-voltage characteristics show distinct features which can be explained only under the assumption that the order parameter of high-T $c/Bi_2$$Sr_2$CaC $u_2$ $O_{8+{\delta}}$ superconductors has a pure d-wave symmetry, which is in contrast to the case of YB $a_2$$Cu_3$O$7+{\delta$}erconductors where a minor s-wave component is also present..

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