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; Naomichi Sakai; Masato 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, Naomichi Sakai, Masato Murakami

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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
Externally published	Yes

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Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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

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.",

author = "H. Kojo and Yoo, {S. I.} and Naomichi Sakai and Masato Murakami",

year = "1997",

language = "English",

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journal = "Superlattices and Microstructures",

issn = "0749-6036",

publisher = "Academic Press Inc.",

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TY - JOUR

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, Naomichi

AU - Murakami, Masato

PY - 1997

Y1 - 1997

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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VL - 21

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JO - Superlattices and Microstructures

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SN - 0749-6036

IS - Suppl A

ER -

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

Abstract

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