TY - JOUR
T1 - Melt-processed LRE-Ba-Cu-O superconductors and prospects for their applications
AU - Yoo, S. I.
AU - Fujimoto, H.
AU - Sakai, N.
AU - Murakami, M.
N1 - Funding Information:
The authors would like to thank Mr. T. Higuchi, Mr. N. Hayashi and Dr. H. Kojo in SRL-ISTEC for helpful discussions. This work was partially supported by NEDO for the R&D of Industrial Science and Technology Frontier Program.
PY - 1997/3/20
Y1 - 1997/3/20
N2 - We have recently found that control of the oxygen partial pressure (PO2) during melt processing, named the oxygen-controlled melt-growth (OCMG) process, is critical for obtaining a high superconducting transition temperature (Tc) in the light rare earth (LRE)-Ba-Cu-O (LREBCO) superconductors particularly for Nd, Sm and Eu. Further, compared to a good melt-processed Y-Ba-Cu-O (YBCO) bulk superconductor, LREBCO bulks exhibit larger critical current density (Jc) in high magnetic field and a much improved irreversibility field (Hirr) at 77 K, implying that more effective flux pinning can be realized in a commercially feasible way. In this paper, properties and characteristic flux pinning of OCMG-processed LREBCO (LRE: Nd,Sm,Eu) superconductors are described on the basis of our study during the last several years. We also present the prospects for bulk-type applications, such as the magnetic bearings, flywheels and magnetically levitated (MAGLEV) trains.
AB - We have recently found that control of the oxygen partial pressure (PO2) during melt processing, named the oxygen-controlled melt-growth (OCMG) process, is critical for obtaining a high superconducting transition temperature (Tc) in the light rare earth (LRE)-Ba-Cu-O (LREBCO) superconductors particularly for Nd, Sm and Eu. Further, compared to a good melt-processed Y-Ba-Cu-O (YBCO) bulk superconductor, LREBCO bulks exhibit larger critical current density (Jc) in high magnetic field and a much improved irreversibility field (Hirr) at 77 K, implying that more effective flux pinning can be realized in a commercially feasible way. In this paper, properties and characteristic flux pinning of OCMG-processed LREBCO (LRE: Nd,Sm,Eu) superconductors are described on the basis of our study during the last several years. We also present the prospects for bulk-type applications, such as the magnetic bearings, flywheels and magnetically levitated (MAGLEV) trains.
KW - Melt processing
KW - Superconductors
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U2 - 10.1016/S0925-8388(96)02864-2
DO - 10.1016/S0925-8388(96)02864-2
M3 - Article
AN - SCOPUS:0346880204
VL - 250
SP - 439
EP - 448
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
IS - 1-2
ER -