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",

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AU - Kojo, H.

AU - Yoo, S. I.

AU - Murakami, M.

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

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KW - Phase diagram

KW - Solid solution

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