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

研究成果: Article › 査読

57 被引用数 (Scopus)

抄録

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.

本文言語	English
ページ（範囲）	85-88
ページ数	4
ジャーナル	Physica C: Superconductivity and its applications
巻	289
号	1-2
DOI	https://doi.org/10.1016/S0921-4534(97)01572-4
出版ステータス	Published - 1997 8月 15
外部発表	はい

ASJC Scopus subject areas

電子材料、光学材料、および磁性材料
凝縮系物理学
エネルギー工学および電力技術
電子工学および電気工学

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10.1016/S0921-4534(97)01572-4

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引用スタイル

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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.",

year = "1997",

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

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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.

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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