• Title/Summary/Keyword: BSCCO 2223

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Analysis of Thermodynamics for Formation of Single Phase in Bi-superconducting Thin Films (Bi 초전도 박막에서 단일상 형성을 위한 열역학 분석)

  • 천민우;박용필
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.05a
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    • pp.623-626
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    • 2002
  • High quality BSCCO thin films have been fabricated by means of an ion beam sputtering at various substrate temperatures, Tsub, and ozone gas pressures, pO$_3$. The correlation diagrams of the BSCCO phases with Tsub and pO$_3$are established in the 2212 and 2223 compositional films. In spite of 2212 compositional sputterina Bi2201 and Bi2223 as well as Bi2212 phases come out as stable phases depending on Tsub and pO$_3$. From these results, the thermodynamic evaluation of ΔH and ΔS, which are related with Gibbs' free energy change for single Bi2212 or Bi2223 phase, was performed.

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The effect of mechanical processing in BSCCO-2223 tape on critical current density (BSCCO-2223계 초전도 선재의 기계적 가공이 임계 전류 밀도에 미치는 영향)

  • 임성우;강형곤;최명호;박경국;한병성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1998.06a
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    • pp.355-357
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    • 1998
  • BSCCO-2223 superconducting tape made by PIT method can be influenced in the critical characteristics by the heat treatment and the mechanical processing. Particulary, it has been reported that the mechanical deformation affects the core density, texture of the core, sausaging and so on. Therefore the accurate control of the deformation process is very important to achieve high J$\sub$c/. In this study, we measured the J$\sub$c/ variation for different rolling reduction rate and investigated the change of core shape to compare the formation of sausaging.

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AC Loss Characteristics of Stacked BSCCO-2223 Tapes by Using Magnetization Method (자화법을 이용한 적층된 BSCCO-2223 교류손실 특성의 해석)

  • Kang, Hyoung-Ku;Nah, Wan-Soo;Joo, Jin-Ho;Yoo, Jai-Moo;Kim, Kye-Soo
    • Proceedings of the KIEE Conference
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    • 1999.07a
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    • pp.262-264
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    • 1999
  • The AC losses of BSCCO-2223 multifilamentary superconducting tapes were measured using magnetization method and compared with the results of theoretically calculated values. In general, AC losses in multifilamentary superconducting tapes could be quantitatively explained by the simple sum of the Hysteresis and Coupling Loss. As a result of experiment, We found that AC losses of multifilamentary superconducting tape increase rapidly in large magnetic field region.

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Analysis of Thermodynamic Conditions for Formation of Single Phase in Bi-superconductor Thin Films (Bi 초전도 박막에서 단일상 형성을 위한 열역학 초건 분석)

  • 안준호;박용필;김정호
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11a
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    • pp.304-307
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    • 2001
  • High quality BSCCO thin films have been fabricated by means of an ion beam sputtering at various substrate temperatures, T$\sub$sub/, and ozone gas pressures, PO$_3$. The correlation diagrams of the BSCCO Phases appeared against T7ub and PO3 are established in the 2212 and 2223 compositional films. In spite of 2212 compositional sputtering, Bi2201 and Bi2223 phases as well as Bi2212 one come out as stable Phases depending on T$\sub$sub/ and PO$_3$. From these results, the thermodynamic evaluations of ΔH and ΔS, which are related with Gibbs' free energy change for single Bi2212 or Bi2223 phase are performed.

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Characteristics of Plasma Sprayed BSCCO Superconductor Coatings with Annealing Time After Partial Melt Process (BSCCO 플라즈마 용사피막의 부분용융열처리 후 어닐링 시간에 따른 초전도 특성)

  • Park, Jeong-Sik;Lee, Seon-Hong;Park, Kyeung-Chae
    • Korean Journal of Materials Research
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    • v.24 no.2
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    • pp.116-122
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    • 2014
  • $Bi_2Sr_2CaCu_2O_x$(Bi-2212) and $Bi_2Sr_2Ca_2Cu_3O_y$(Bi-2223) high-Tc superconductors(HTS) have been manufactured by plasma spraying, partial melt process(PMP) and annealing treatment(AT). A Bi-2212/2223 HTS coating layer was synthesized through the peritectic reaction between a 0212 oxide coating layer and 2001 oxide coating layer by the PMP-AT process. The 2212 HTS layer consists of whiskers grown in the diffusion direction. The Bi-2223 phase and secondary phase in the Bi-2212 layer were observed. The secondary phase was distributed uniformly over the whole layer. As annealing time goes on, the Bi-2212 phase decreases with mis-orientation and irregular shape, but the Bi-2223 phase increases because a new Bi-2223 phase is formed inside the pre-existing Bi-2212 crystals, and because of the nucleation of a Bi-2223 phase at the edge of Bi-2212 crystals by diffusion of Ca and Cu-O bilayers. In this study the spray coated layer showed superconducting transitions with an onset Tc of about both 115 K, and 50 K. There were two steps. Step 1 at 115 K is due to the diamagnetism of the Bi-2223 phase and step 2 at 50 K is due to the diamagnetism of the Bi-2212 phase.

BSCCO Thin Films Fabricated by ion Beam Sputtering Method (IBS법으로 제작한 BSCCO 박막의 상안정 영역)

  • 양승호;양동복;박용필
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2003.05a
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    • pp.538-541
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    • 2003
  • BSCCO superconducting thin films have been fabricated by co-deposition using IBS(Ion Beam Sputtering) method. Despite setting the composition of thin film Bi2212 or Bi2223, in both cases, Bi2201, Bi2212 and Bi2223 phase were appeared. It was confirmed the obtained field of stabilizing phase was represented in the diagonal direction of the right below end in the Arrhenius plot of temperature of the substrate and PO$_3$, and it was distributed in the rezone. The XRD peak of the generated film continuously changed according to the substrate temperature.

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Thermodynamic Conditions for Formation of Single Phase in BSCCO Thin Films (BSCCO 박막에서 단일상 형성을 위한 열역학 조건)

  • 이동규;박용필
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.15 no.2
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    • pp.173-177
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    • 2002
  • High quality BSCCO thin films have been fabricated by means of an ion beam sputtering at various substrate temperatures, T$\sub$sub/, and ozone gas pressures, pO$_3$. The correlation diagrams of the BSCCOphases with T$\sub$sub/ and pO$_3$ are established in the 2212 and 2223 phases come out as stable phases depending on T$\sub$sub/ and pO$_3$. From these results, the thermodynamic evaluation of ΔH and ΔS, which are related with Gibbs\` free energy change for single Bi2212 or Bi2223 phase, were performed.

Fabrication of Superconductive Joining of Multi-filamentary BSCCO(2223) Tape (BSCCO(2223) 다심선재의 초전도 접합공정 연구)

  • 김규태;김정호;장석헌;주진호;나완수
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2002.02a
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    • pp.111-113
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    • 2002
  • We jointed BSCCO multi-filament tapes and evaluated their electrical properties. In the process, two superconductive-joint methods were used; the two multi-filament tapes were directly connected each other(MM joint), and were connected through the single-filament tape inserted between them(MSM joint). It was observed that critical current ratio and n value were 25-29% and 2.5-2.8 for MM jointed tape, and 34-53% and 3.7-4.2 for MSM Jointed tape, respectively. The higher electrical properties for MSM tape is considered to be due to that the presence of single core results in better interconnections of multi-filaments from the two tapes.

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Transport current loss of YBCO Coated Conductor and Bi-2223 tape (Bi-2223 선재와 YBCO Coated Conductor 선재의 전송전류 손실 비교)

  • Lim Hyoungwoo;Lee Kwangyoun;Cha Gueesoo;Lee Jikwang;Park Chan
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.1010-1012
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    • 2004
  • AC loss is an important factor in the development of superconducting tapes and superconducting power applications. In this paper we measured and compared characteristics of BSCCO tape and YBCO Coated Conductor(YBCO CC). BSCCO tape was fabricated by PIT method. We measured critical current density and transport current loss of it. Also, YBCO CC tape consist of substrate. buffer, YBCO and metal layers. We measured critical current density on variations of external magnetic field and transport current loss of these cases. The results of measurement show that normalized critical current of YBCO CC is smaller then that of BSCCO tape in the external magnet field. According to the results. measured loss and calculated of the YBCO CC show the same tendency.

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