Control of the Nd422 second phase for the improvement of the critical current density in Nd-Ba-Cu-O superconductors

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

Control of the Nd422 second phase for the improvement of the critical current density in Nd-Ba-Cu-O superconductors

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

Research output: Contribution to journal › Article

Abstract

Effects of size and volume fraction of the Nd₄Ba₂Cu₂O₁₀ (Nd422) second phase on the critical current density (J_c) were studied for the Nd-Ba-Cu-O bulk superconductors fabricated by an oxygen-controlled-melt-growth (OCMG) process. The size of the Nd422 second phase trapped in NdBa₂Cu₃O_y (Nd123) superconducting matrix was controlled using two different precursors of Nd123-Nd422 powders and the melt-quenched powders. Finer Nd422 second phase with an average diameter of 1-2μm was obtained in the sample fabricated from the mixture of Nd123-Nd422 precursors when the initial Nd422 powders of less than 1μm was employed. The J_c was significantly improved especially in low field by refining the Nd422 second phase. While a small amount of Nd422 addition increases the J_c in low field without sacrificing the J_c near the fishtail peak, the peak effect was drastically depressed by increasing the volume fraction.

Original language	English
Pages (from-to)	83-86
Number of pages	4
Journal	Superlattices and Microstructures
Volume	21
Issue number	Suppl A
Publication status	Published - 1997 Jan 1
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Electrical and Electronic Engineering

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Kojo, H., Yoo, S. I., Sakai, N., & Murakami, M. (1997). Control of the Nd422 second phase for the improvement of the critical current density in Nd-Ba-Cu-O superconductors. Superlattices and Microstructures, 21(Suppl A), 83-86.

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abstract = "Effects of size and volume fraction of the Nd4Ba2Cu2O10 (Nd422) second phase on the critical current density (Jc) were studied for the Nd-Ba-Cu-O bulk superconductors fabricated by an oxygen-controlled-melt-growth (OCMG) process. The size of the Nd422 second phase trapped in NdBa2Cu3Oy (Nd123) superconducting matrix was controlled using two different precursors of Nd123-Nd422 powders and the melt-quenched powders. Finer Nd422 second phase with an average diameter of 1-2μm was obtained in the sample fabricated from the mixture of Nd123-Nd422 precursors when the initial Nd422 powders of less than 1μm was employed. The Jc was significantly improved especially in low field by refining the Nd422 second phase. While a small amount of Nd422 addition increases the Jc in low field without sacrificing the Jc near the fishtail peak, the peak effect was drastically depressed by increasing the volume fraction.",

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T1 - Control of the Nd422 second phase for the improvement of the critical current density in Nd-Ba-Cu-O superconductors

AU - Kojo, H.

AU - Yoo, S. I.

AU - Sakai, N.

AU - Murakami, M.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - Effects of size and volume fraction of the Nd4Ba2Cu2O10 (Nd422) second phase on the critical current density (Jc) were studied for the Nd-Ba-Cu-O bulk superconductors fabricated by an oxygen-controlled-melt-growth (OCMG) process. The size of the Nd422 second phase trapped in NdBa2Cu3Oy (Nd123) superconducting matrix was controlled using two different precursors of Nd123-Nd422 powders and the melt-quenched powders. Finer Nd422 second phase with an average diameter of 1-2μm was obtained in the sample fabricated from the mixture of Nd123-Nd422 precursors when the initial Nd422 powders of less than 1μm was employed. The Jc was significantly improved especially in low field by refining the Nd422 second phase. While a small amount of Nd422 addition increases the Jc in low field without sacrificing the Jc near the fishtail peak, the peak effect was drastically depressed by increasing the volume fraction.

AB - Effects of size and volume fraction of the Nd4Ba2Cu2O10 (Nd422) second phase on the critical current density (Jc) were studied for the Nd-Ba-Cu-O bulk superconductors fabricated by an oxygen-controlled-melt-growth (OCMG) process. The size of the Nd422 second phase trapped in NdBa2Cu3Oy (Nd123) superconducting matrix was controlled using two different precursors of Nd123-Nd422 powders and the melt-quenched powders. Finer Nd422 second phase with an average diameter of 1-2μm was obtained in the sample fabricated from the mixture of Nd123-Nd422 precursors when the initial Nd422 powders of less than 1μm was employed. The Jc was significantly improved especially in low field by refining the Nd422 second phase. While a small amount of Nd422 addition increases the Jc in low field without sacrificing the Jc near the fishtail peak, the peak effect was drastically depressed by increasing the volume fraction.

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