Composite Effect of Ag and Au in the $Bi_{1.84}\;Pb_{0.34}\;Sr_{1.91}\;Ca_{2.03}\;Cu_{3.06}\;O_{10+\delta}$(110K Phase) High-Tc Superconductor

Ag와 Au가 혼합된 $Bi_{1.84}\;Pb_{0.34}\;Sr_{1.91}\;Ca_{2.03}\;Cu_{3.06}\;O_{10+\delta}$ 산화물 고온초전도체의 초전도특성

  • 이민수 (한밭대 환경보존방재연구소)
  • Published : 2003.06.01


$Bi_{1.84}Pb_{0.34}Sr_{1.91}Ca_{2.03}Cu_{3.06}O_{10+\delta}$ high $T_{c}$ superconductors containing Ag as an additive were fabricated by a solid-state reaction method. The superconducting properties, such as the structural characteristics, the critical temperatures, the grain size and the image of mapping on the surface were investigated. Samples with Ag and Au of 50 wt% each were sintered at various temperature(820~$850^{\circ}C$). The structural characteristics, the microstructure of surface and the critical temperature with respect to the each samples were analyzed by XRD and SEM, EDS and four-prove methode respectively. The critical temperature showed the result which the Ag additive samples are higher than Au additive samples. The microstructure of the surface showed the tendency which the Ag additive samples become more minuteness than Au additive samples.




  1. H. Faqir, H. Chiba, O. Monnereau, G. Vacquier, M. Kikuchi and Y. Syono, 'An Investigation of the Transformation from Bi2Sr2CaCu208 to Bi2Sr2Ca2Cu2O10', J. Solid State Chemistry, Vol. 139, pp. 1-7, 1998
  2. M. Xie, L. W. Zhang, T. G. Chen, X. T. Li and J. Cai, 'Formation and Decomposition of a Ca2PbO4-modified Phase in the Bil.6Pb0.4Sr2Ca2Cu3Ox Compound', Physica C, Vol. 206, pp. 254-256, 1993
  3. W. G. Wang, P. A. Bain, J. Horvat, B. Zeimetz, Y. C: Guo, H. K. Liu and S. X. Dou, 'Preparation of Ag-Bi-2223 Tape by Controlling the Phase Evolution Prior to Sintering', Supercond. Sci. Technol., Vol. 9, pp. 881-887, 1996
  4. W. Wong-Ng and L. P. Cook, 'Effect of Po2 and Ag on the Phase Formation of the Bi(Pb)-2223 Superconductor', J. Matter. Res., Vol. 14, No. 5, pp. 1695-1705, 1999
  5. W. K. Wong-Ng, L. P. Cook and F. Jiang, 'Melting Equilibria of the Bi-Sr-Ca-Cu-O(BSCCO)System in Air : The Primary Crystallization Phase Field of the 2212 Phase and the Effect of Silver Addition', J. Am. Ceram. Soc, Vol. 81, No. 7, pp. 1829-1838, 1998
  6. N. Hirano and S. Nagaya, 'Ag doping effects on the microstructure and properties of unidirectional grown Y-Ba-Cu-0 superconductors', IEEE Trans. Appl. Supercond., Vol. 5, pp. 1564-1567, 1995
  7. A. Otto, L. J. Masur, C. Craven, D. Daly, E. R. Podtburg and J. Screiber, 'Progress Towards a Long Length Metallic Precursor Process for Multifilament Bi-2223 Composite Superconductors', IEEE Transactions on Applied Superconduc- tivity, Vol. 5, No. 2, pp. 1154-1157, 1995
  8. K. Yoshida, Y. Sano and Y. Tomil, 'Precipitation of Impurity Phase and its Effect on the Intergrain Conducting Properties of Ag-doped Bi(Pb)-Sr-Ca-Cu-O', Supercond. Sci. Technol., Vol. 8, No. 5, pp. 329-335, 1995
  9. N. N. Merchant, D. J. Miller and V. A. Maroni, 'Phase Stability and Grain Growth in an Ag/Bi-2223 Composite Conductor Prepared Using Fine-Grained Bi-2223 as a Precursor', IEEE Transactions on Applied Superconductivity, Vol. 9, No. 2, pp. 2545-2548, 1999
  10. X. Y. Lu, A. Nagata, K. Sugaware and S. Kamada, 'Grain Alignment and Critical Current Densities of (Bi,Pb)-2223 Phase in the Partical-melting and Sintering Process', Supercond. Sci. Technol., Vol. 12, No. 12, pp. 1098-1101, 1999
  11. M. Ishizuka, Y. Tanaka, T. Hashimoto and H. Maeda, 'Influences of Cu Composition and Sintering Condition in Bi-2223 Tapes using Ag-Cu Alloy Sheath Doped with Ti, Zr or Hf', Physica C, Vol. 290, No. 3&4, pp. 265-274, 1997
  12. L. Jiang, Y. Sun, X. Wan, K. Wang, G. Xu, X. Chen, K. Ruan and J. Du, 'Improvement of Formation and Superconductivity of the (Bi,Pb) 2Sr2Ca2Cu30x Silver-sheathed Tape with B203 Addition', Physica C, Vol. 300, No. 1-2, pp. 61-66, 1998
  13. T. A. Deis, M. Lelovic, N. G. Eror and U. Balachandran, 'Effect of Ag Doping on Structure and Critical Temperature of $Bi2Sr2CaCu2O8+{\delta}$ Superconductors', Applied Superconductivity, Vol. 6, No. 6, pp. 279-284, 1998
  14. J. Maeda, T. Izumi and Y. Shiohara, 'Reaction between YBCO/Ag Superconductor and Melted Silver', Supercond. Sci. Technol., Vol. 12, No. 1. pp. 45-47, 1999
  15. S. X. Dou, X. L. Wang, Y. C. Guo, Q. Y. Hu, P. Mikheenko, J. Horvat, M. Ionescu and H. K. Liu, 'Introduction of Pinning Centres into Bi-(Pb)-Sr-Ca-Cu-0 Superconductors,' Supercond. Sci. Technol., Vol. 10, No. 7A, pp. A52-A67, 1997
  16. J. A. Parrell, D. C. Larbalestir, G. N. Riley, Jr., Q. Li, W. L. Carter, R. D. Parrella and M. Teplitsky, 'Connectivity and Flux Pinning Improvements in Ag-clad BSCCO-2223 Tapes Produced by Changes in the Cooling Rate,' J. Mater. Res., Vol. 12, No. 11, pp. 2997-3008, 1997
  17. Y. K. Huang, B. ten Haken and H. H. J. ten Kate, 'Critical Current of High Tc Superconducting Bi2223/Ag Tapes,' Physica C, Vol. 309, pp. No. 3&4, pp. 197-202, 1998
  18. T. Muroga, J. Sato, H. Kitaguchi, H. Kumakura, K. Togano and M. Okada, 'Enhancement of Critical Current Density for Bi-2212/Ag Tape Conductors Through, Microstructure Control,' Physica C, Vol. 309, pp. 236-244, 1998
  19. J. A. Parrell an Y. Feng, S. E. Dorris and D. C. Larbalestier, 'Controlled Decomposition and Reformation of the 2223 Phase in Ag-clad (Bi,Pb)2Sr2-Ca2Cu30x Tapes and its Influence on the Microstructure and Critical Current Density,' J. Mater. Res., Vol. 11, No. 3, pp. 555-564, 1996
  20. P. Majewski, S. Elscner, B. Hettich, C. Lang, S. Kaesche and F. Aldinger, 'The Increase of Pinning in (Bi,Pb)2Sr2Ca2Cu3O10+d Bulk Ceramics,' Supercond. Sci. Technol., Vol. 7, pp. 514-517, 1994
  21. F. Shi, T. S. Rong, S. Z. Zhou, X. F. Wu, J. Du, Z. H. Shi, C. G. Cui, R. Y. Jin, J. L. Zhang, Q. Z. Ran and N. C. Shi, 'Preparation Process, Crystal Structure, and Physical Properties of the 110-K Single-phase Pb-Bi-Sr-Ca-Cu-O Superconductor', Phys. Rev. B, Vol. 41, No. 10-A, pp. 6541-6546, 1990
  22. T. Chiba, Y.-L. Wang, R. L. Sabatini, Qiang Li, L.-J. Wu, M. Suenaga, P. Haider and K. Noto, 'Enhanced Critical Current in Bi2Sr2Ca2Cu3O10/Ag Tapes by a Low-temperature Intermediate Heat Treatment,' Physica C, vol. 308, pp. 40-54, 1998
  23. P. V. P. S. S. Sastry, J. V. Yakhmi and R. M. Iyer, 'Towards the Synthesis of the Single-phase Bi-2223 Superconductor from Stoichiometric (Bi,Pb) 2Ca2Sr2Cu30y Compositions', Physica C, Vol. 161, No. 5&6, pp. 656-660 1989
  24. S. Koyama, U. Endo and T. Kawai, 'Preparation of Single 110 K phase of the Bi-Pb-Sr-Ca-Cu-0 Superconductor', Jpn. J. Appl. Phys., Vol. 27, No. 10, pp. L1861-L1863, 1988
  25. M. A. Beno, L. Soderholm, D. W. Capone II, D. G. Hinks, J. D. Jorgensen, J. D. Grace, I. K. Schuller, C. U. Segre and K. Zhang, 'Structure of the Single-phase High-temperature Superconductor YBa2Cu3O7-d', Appl. Phys. Lett., Vol. 51, No. 1, pp. 57-59, 1987