Development of technology for a reliable fabrication of LRE-123 materials for levitation applications above 80 K

M. Muralidhar; N. Sakai; M. Jirsa; M. Murakami; N. Koshizuka; I. Hirabayashi

doi:10.1016/j.physc.2005.01.049

Development of technology for a reliable fabrication of LRE-123 materials for levitation applications above 80 K

M. Muralidhar, N. Sakai, M. Jirsa, M. Murakami, N. Koshizuka, I. Hirabayashi

Research output: Contribution to journal › Conference article › peer-review

1 Citation (Scopus)

Abstract

Nanoscale secondary phase Gd₂BaCuO₅ "Gd-211" particles less than 60 nm in size, added to mixed ternary LREBa₂Cu₃O_y [LRE = (Nd_0.33Eu _0.33Gd_0.33), (Sm_0.33Eu_0.33Gd _0.33), (Nd_0.33Sm_0.33Gd_0.33)] "NEG-123, SEG-123, NSG-123" oxide powders and melt-processed in Ar-1%pO₂ gas mixture, significantly improve electromagnetic performance at low magnetic fields. As confirmed by transmission electron microscopy and dynamic force microscopy, the nanoparticles in the LRE-123 matrix not only survive the melt-texturing process but, thanks to their contamination by Zr coming from ball milling process, these particles in majority transform into a new type of even smaller defects. Further improvement in flux pinning was reached when both 123 and 211 powders were thoroughly ball milled before the melt-growth process to the similar small size. As a result, J_c values of 260 kA/cm² and 55 kA/cm² were observed in remnant state at 77 K and 90 K, respectively.

Original language	English
Pages (from-to)	777-782
Number of pages	6
Journal	Physica C: Superconductivity and its applications
Volume	426-431
Issue number	I
DOIs	https://doi.org/10.1016/j.physc.2005.01.049
Publication status	Published - 2005 Oct 1
Event	Proceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity - Duration: 2004 Nov 23 → 2004 Nov 25

Keywords

Critical current density (J)
Flux pinning
LRE-123 melt textured compounds
Levitation at 90.2 K
Microstructure

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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10.1016/j.physc.2005.01.049

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@article{56b4e0691fd84cae92a6e6e1cef274b3,

title = "Development of technology for a reliable fabrication of LRE-123 materials for levitation applications above 80 K",

abstract = "Nanoscale secondary phase Gd2BaCuO5 {"}Gd-211{"} particles less than 60 nm in size, added to mixed ternary LREBa2Cu3Oy [LRE = (Nd0.33Eu 0.33Gd0.33), (Sm0.33Eu0.33Gd 0.33), (Nd0.33Sm0.33Gd0.33)] {"}NEG-123, SEG-123, NSG-123{"} oxide powders and melt-processed in Ar-1%pO2 gas mixture, significantly improve electromagnetic performance at low magnetic fields. As confirmed by transmission electron microscopy and dynamic force microscopy, the nanoparticles in the LRE-123 matrix not only survive the melt-texturing process but, thanks to their contamination by Zr coming from ball milling process, these particles in majority transform into a new type of even smaller defects. Further improvement in flux pinning was reached when both 123 and 211 powders were thoroughly ball milled before the melt-growth process to the similar small size. As a result, Jc values of 260 kA/cm2 and 55 kA/cm2 were observed in remnant state at 77 K and 90 K, respectively.",

keywords = "Critical current density (J), Flux pinning, LRE-123 melt textured compounds, Levitation at 90.2 K, Microstructure",

author = "M. Muralidhar and N. Sakai and M. Jirsa and M. Murakami and N. Koshizuka and I. Hirabayashi",

year = "2005",

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doi = "10.1016/j.physc.2005.01.049",

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

issn = "0921-4534",

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note = "Proceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity ; Conference date: 23-11-2004 Through 25-11-2004",

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TY - JOUR

T1 - Development of technology for a reliable fabrication of LRE-123 materials for levitation applications above 80 K

AU - Muralidhar, M.

AU - Sakai, N.

AU - Jirsa, M.

AU - Murakami, M.

AU - Koshizuka, N.

AU - Hirabayashi, I.

PY - 2005/10/1

Y1 - 2005/10/1

N2 - Nanoscale secondary phase Gd2BaCuO5 "Gd-211" particles less than 60 nm in size, added to mixed ternary LREBa2Cu3Oy [LRE = (Nd0.33Eu 0.33Gd0.33), (Sm0.33Eu0.33Gd 0.33), (Nd0.33Sm0.33Gd0.33)] "NEG-123, SEG-123, NSG-123" oxide powders and melt-processed in Ar-1%pO2 gas mixture, significantly improve electromagnetic performance at low magnetic fields. As confirmed by transmission electron microscopy and dynamic force microscopy, the nanoparticles in the LRE-123 matrix not only survive the melt-texturing process but, thanks to their contamination by Zr coming from ball milling process, these particles in majority transform into a new type of even smaller defects. Further improvement in flux pinning was reached when both 123 and 211 powders were thoroughly ball milled before the melt-growth process to the similar small size. As a result, Jc values of 260 kA/cm2 and 55 kA/cm2 were observed in remnant state at 77 K and 90 K, respectively.

AB - Nanoscale secondary phase Gd2BaCuO5 "Gd-211" particles less than 60 nm in size, added to mixed ternary LREBa2Cu3Oy [LRE = (Nd0.33Eu 0.33Gd0.33), (Sm0.33Eu0.33Gd 0.33), (Nd0.33Sm0.33Gd0.33)] "NEG-123, SEG-123, NSG-123" oxide powders and melt-processed in Ar-1%pO2 gas mixture, significantly improve electromagnetic performance at low magnetic fields. As confirmed by transmission electron microscopy and dynamic force microscopy, the nanoparticles in the LRE-123 matrix not only survive the melt-texturing process but, thanks to their contamination by Zr coming from ball milling process, these particles in majority transform into a new type of even smaller defects. Further improvement in flux pinning was reached when both 123 and 211 powders were thoroughly ball milled before the melt-growth process to the similar small size. As a result, Jc values of 260 kA/cm2 and 55 kA/cm2 were observed in remnant state at 77 K and 90 K, respectively.

KW - Critical current density (J)

KW - Flux pinning

KW - LRE-123 melt textured compounds

KW - Levitation at 90.2 K

KW - Microstructure

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Y2 - 23 November 2004 through 25 November 2004

ER -

Development of technology for a reliable fabrication of LRE-123 materials for levitation applications above 80 K

Abstract

Keywords

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