Microstructure and Electrical Properties of (YNdSm)-Ba-Cu-O High Tc Composite Superconductors by Zone Melting Process

존멜팅법으로 제조한 (YNdSm)-Ba-Cu-O계 고온복합초전도체의 미세구조 및 전기적 특성

Kim, So-Jung;Lee, Sang-Heon

  • Received : 2016.01.18
  • Accepted : 2016.01.24
  • Published : 2016.02.01


(YNdSm)-Ba-Cu-O system high Tc composite superconductors were directionally grown by zone melting process, having large temperature gradient, in air atmosphere. Cylindrical green rods of $(YNdSm)_{1.8}Ba_{2.4}Cu_{3.4}O_x$ [(YNS)1.8]composite oxides by CIP (cold isostatic pressing) method using rubber mold were fabricated. The microstructure and superconducting properties were investigated by XRD, TEM and SQUID magnetometer. The size of nonsuperconducting $(YNdSm)_2BaCuO_5$ inclusions of the melt-textured (YNS)1.8 sample with $CeO_2$ additive were remarkably reduced and uniformly distributed within the superconducting (YNS)1.8 matrix. (YNS)1.8 samples, with / without $CeO_2$ additive, showed an onset $T_c{\geq}90K$ and sharp superconducting transition. The critical current density $J_c$ value of the (YNdSm)1.8 superconductor with $CeO_2$ additive were 840 A, $1.2{\times}104A/cm^2$ in 77 K, 0 Tesla by direct current transport method.


(YNS)-B-C-O;Composites;CIP;$CeO_2$;Zone melting process


  1. P. McGinn, W. Chen, N. Zhu, M. Lanagan, and U. Balachandran, Appl. Phys. Lett., 57, 1455 (1990). [DOI:]
  2. D. Shi, H. Krishnan, J. M. Hong, D. Miller, P. J. McGinn, W. H. Chen, M. Xu, J. G. Chen, M. M. Fang, U. Welp, M. T. Lanagan, K. C. Goretta, J. T. Dusek, J. J. Picciolo, and U. Balachandran, J. Appl. Phys., 68, 228 (1990). [DOI:]
  3. S. J. Kim, J. Ceramic Processing Research, 7, 235 (2006).
  4. M. Murakami, N. Sakai, T. Higuchi, and S. I. Yoo, Supercond. Sci. Technol., 9, 1015 (1996). [DOI:]
  5. C. J. Kim, H. W. Park, K. B. Kim, and G. W. Hong, Supercond. Sci. Technol., 8, 652 (1995). [DOI:]
  6. S. J. Kim, J. Korean. Inst. Electr. Electron. Mater. Eng., 15, 269 (2002). [DOI:]