Levitation of NEG-123 at the temperature of liquid oxygen (90.2 K)

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

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Abstract

A long-term Zr2O3 ball milling of Gd2BaCuO5 secondary phase particles dispersed in the melt-textured (Nd0.33Eu0.33Gd0.33) Ba2Cu3Oy (NEG-123) compound brought a superb enhancement of electromagnetic performance of this composite at high temperatures: at 77.3 K, Jc reached 192 kA cm-2, at 90.2 K (temperature of liquid oxygen) the remnant Jc was 40 kA cm-2, a value high enough for levitation experiments. Energy dispersive x-ray analysis found small Zr-rich secondary phase particles of only 20-50 nm in size, while the mean particle size after the milling was 70-200 nm, according to the milling time. This new particle size reduction mechanism enables the design of non-contact liquid oxygen pumps for industrial applications.

Original languageEnglish
Pages (from-to)L46-L48
JournalSuperconductor Science and Technology
Volume16
Issue number11
DOIs
Publication statusPublished - 2003 Nov

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ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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