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

Muralidhar Miryala, Naomichi Sakai, M. Jirsa, Masato Murakami, N. Koshizuka, I. Hirabayashi

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)777-782
Number of pages6
JournalPhysica C: Superconductivity and its Applications
Volume426-431
Issue numberI
DOIs
Publication statusPublished - 2005 Oct 1

Fingerprint

levitation
Powders
balls
Flux pinning
Fabrication
fabrication
Texturing
flux pinning
Ball milling
Gas mixtures
Oxides
gas mixtures
Microscopic examination
contamination
Contamination
Magnetic fields
electromagnetism
Nanoparticles
Transmission electron microscopy
microscopy

Keywords

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

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Development of technology for a reliable fabrication of LRE-123 materials for levitation applications above 80 K. / Miryala, Muralidhar; Sakai, Naomichi; Jirsa, M.; Murakami, Masato; Koshizuka, N.; Hirabayashi, I.

In: Physica C: Superconductivity and its Applications, Vol. 426-431, No. I, 01.10.2005, p. 777-782.

Research output: Contribution to journalArticle

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