Melt-processed LRE-Ba-Cu-O superconductors and prospects for their applications

S. I. Yoo; H. Fujimoto; N. Sakai; M. Murakami

doi:10.1016/S0925-8388(96)02864-2

Melt-processed LRE-Ba-Cu-O superconductors and prospects for their applications

S. I. Yoo, H. Fujimoto, N. Sakai, M. Murakami

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

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 (T_c) 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 (J_c) in high magnetic field and a much improved irreversibility field (H_irr) 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.

Original language	English
Pages (from-to)	439-448
Number of pages	10
Journal	Journal of Alloys and Compounds
Volume	250
Issue number	1-2
DOIs	https://doi.org/10.1016/S0925-8388(96)02864-2
Publication status	Published - 1997 Mar 20
Externally published	Yes

Keywords

Melt processing
Superconductors

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "Melt-processed LRE-Ba-Cu-O superconductors and prospects for their applications",

abstract = "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.",

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AU - Yoo, S. I.

AU - Fujimoto, H.

AU - Sakai, N.

AU - Murakami, M.

PY - 1997/3/20

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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.

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