Melt processing of high-Tc Nd-Ba-Cu-O superconductors in air

H. Kojo; S. I. Yoo; M. Murakami

doi:10.1016/S0921-4534(97)01572-4

Melt processing of high-T_c Nd-Ba-Cu-O superconductors in air

H. Kojo, S. I. Yoo, M. Murakami

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

57 Citations (Scopus)

Abstract

We have succeeded in fabricating Nd-Ba-Cu-O bulk superconductors, which exhibit high T_c and a sharp superconducting transition, by the melt process in air without additional high temperature annealing in a reduced oxygen atmosphere. The key to this achievement is the use of Ba-rich Nd_4-2zBa_2+2zCu_2-zO_10-δ as a precursor. Fabricated bulk samples exhibit onset T_c values of 94-95 K and the secondary peak effect in the M-H loop like the case of Nd-Ba-Cu-O superconductors produced by melt processing in a reduced oxygen atmosphere. The peak position and the irreversibility field for the best sample were about 1.2 T and 5 T at 77.3 K, respectively, and the estimated J_c at the peak field was about 2.3 × 10⁴ A cm^-2.

Original language	English
Pages (from-to)	85-88
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	289
Issue number	1-2
DOIs	https://doi.org/10.1016/S0921-4534(97)01572-4
Publication status	Published - 1997 Aug 15
Externally published	Yes

Keywords

Critical current density
Melt process
Nd-ba-cu-o
Phase diagram
Solid solution
Superconductor

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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title = "Melt processing of high-Tc Nd-Ba-Cu-O superconductors in air",

abstract = "We have succeeded in fabricating Nd-Ba-Cu-O bulk superconductors, which exhibit high Tc and a sharp superconducting transition, by the melt process in air without additional high temperature annealing in a reduced oxygen atmosphere. The key to this achievement is the use of Ba-rich Nd4-2zBa2+2zCu2-zO10-δ as a precursor. Fabricated bulk samples exhibit onset Tc values of 94-95 K and the secondary peak effect in the M-H loop like the case of Nd-Ba-Cu-O superconductors produced by melt processing in a reduced oxygen atmosphere. The peak position and the irreversibility field for the best sample were about 1.2 T and 5 T at 77.3 K, respectively, and the estimated Jc at the peak field was about 2.3 × 104 A cm-2.",

keywords = "Critical current density, Melt process, Nd-ba-cu-o, Phase diagram, Solid solution, Superconductor",

author = "H. Kojo and Yoo, {S. I.} and M. Murakami",

note = "Funding Information: The authors would like to thank Toshima Co. Ltd for the preparation of sintered powders and DOWA Mining for compositional analysis with ICP. This work was partially supported by NEDO for the R&D Industrial Science and Technology Frontier Program. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.",

year = "1997",

month = aug,

day = "15",

doi = "10.1016/S0921-4534(97)01572-4",

language = "English",

volume = "289",

pages = "85--88",

journal = "Physica C: Superconductivity and its Applications",

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AU - Kojo, H.

AU - Yoo, S. I.

AU - Murakami, M.

N1 - Funding Information: The authors would like to thank Toshima Co. Ltd for the preparation of sintered powders and DOWA Mining for compositional analysis with ICP. This work was partially supported by NEDO for the R&D Industrial Science and Technology Frontier Program. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.

PY - 1997/8/15

Y1 - 1997/8/15

N2 - We have succeeded in fabricating Nd-Ba-Cu-O bulk superconductors, which exhibit high Tc and a sharp superconducting transition, by the melt process in air without additional high temperature annealing in a reduced oxygen atmosphere. The key to this achievement is the use of Ba-rich Nd4-2zBa2+2zCu2-zO10-δ as a precursor. Fabricated bulk samples exhibit onset Tc values of 94-95 K and the secondary peak effect in the M-H loop like the case of Nd-Ba-Cu-O superconductors produced by melt processing in a reduced oxygen atmosphere. The peak position and the irreversibility field for the best sample were about 1.2 T and 5 T at 77.3 K, respectively, and the estimated Jc at the peak field was about 2.3 × 104 A cm-2.

AB - We have succeeded in fabricating Nd-Ba-Cu-O bulk superconductors, which exhibit high Tc and a sharp superconducting transition, by the melt process in air without additional high temperature annealing in a reduced oxygen atmosphere. The key to this achievement is the use of Ba-rich Nd4-2zBa2+2zCu2-zO10-δ as a precursor. Fabricated bulk samples exhibit onset Tc values of 94-95 K and the secondary peak effect in the M-H loop like the case of Nd-Ba-Cu-O superconductors produced by melt processing in a reduced oxygen atmosphere. The peak position and the irreversibility field for the best sample were about 1.2 T and 5 T at 77.3 K, respectively, and the estimated Jc at the peak field was about 2.3 × 104 A cm-2.

KW - Critical current density

KW - Melt process

KW - Nd-ba-cu-o

KW - Phase diagram

KW - Solid solution

KW - Superconductor

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