Superconducting levitation at 90 K - A base for construction of non-contact liquid oxygen pumps

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2 Citations (Scopus)

Abstract

We report on a new type of nanometre-scale pinning defect in melt-processed (Nd, Eu, Gd)Ba2Cu3Oy, 'NEC-123' with a Gd 2BaCuO5 (Gd-211) addition. A reasonable amount of the Gd-211 particles refined by a long-term ball milling to about 70-200 nm reduced their size during the melt-texturing process down to 20-50 nm. Chemical analyses revealed that these particles contained a significant amount of zirconium. These particles caused Jc enhancement by an order of magnitude not only at 77 K but also at 90 K. As a result, we could levitate a permanent magnet over the (Nd, Eu, Gd)Ba2Cu3Oy superconductor cooled by liquid oxygen. This is a path to non-contact pumps of liquid oxygen for different fields of practice.

Original languageEnglish
JournalSuperconductor Science and Technology
Volume18
Issue number2
DOIs
Publication statusPublished - 2005 Feb

Fingerprint

liquid oxygen
levitation
Pumps
pumps
Oxygen
Texturing
Ball milling
Liquids
Zirconium
Permanent magnets
Superconducting materials
permanent magnets
Defects
balls
augmentation
defects

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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title = "Superconducting levitation at 90 K - A base for construction of non-contact liquid oxygen pumps",
abstract = "We report on a new type of nanometre-scale pinning defect in melt-processed (Nd, Eu, Gd)Ba2Cu3Oy, 'NEC-123' with a Gd 2BaCuO5 (Gd-211) addition. A reasonable amount of the Gd-211 particles refined by a long-term ball milling to about 70-200 nm reduced their size during the melt-texturing process down to 20-50 nm. Chemical analyses revealed that these particles contained a significant amount of zirconium. These particles caused Jc enhancement by an order of magnitude not only at 77 K but also at 90 K. As a result, we could levitate a permanent magnet over the (Nd, Eu, Gd)Ba2Cu3Oy superconductor cooled by liquid oxygen. This is a path to non-contact pumps of liquid oxygen for different fields of practice.",
author = "Muralidhar Miryala and Naomichi Sakai and M. Jirsa and Masato Murakami and N. Koshizuka",
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T1 - Superconducting levitation at 90 K - A base for construction of non-contact liquid oxygen pumps

AU - Miryala, Muralidhar

AU - Sakai, Naomichi

AU - Jirsa, M.

AU - Murakami, Masato

AU - Koshizuka, N.

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N2 - We report on a new type of nanometre-scale pinning defect in melt-processed (Nd, Eu, Gd)Ba2Cu3Oy, 'NEC-123' with a Gd 2BaCuO5 (Gd-211) addition. A reasonable amount of the Gd-211 particles refined by a long-term ball milling to about 70-200 nm reduced their size during the melt-texturing process down to 20-50 nm. Chemical analyses revealed that these particles contained a significant amount of zirconium. These particles caused Jc enhancement by an order of magnitude not only at 77 K but also at 90 K. As a result, we could levitate a permanent magnet over the (Nd, Eu, Gd)Ba2Cu3Oy superconductor cooled by liquid oxygen. This is a path to non-contact pumps of liquid oxygen for different fields of practice.

AB - We report on a new type of nanometre-scale pinning defect in melt-processed (Nd, Eu, Gd)Ba2Cu3Oy, 'NEC-123' with a Gd 2BaCuO5 (Gd-211) addition. A reasonable amount of the Gd-211 particles refined by a long-term ball milling to about 70-200 nm reduced their size during the melt-texturing process down to 20-50 nm. Chemical analyses revealed that these particles contained a significant amount of zirconium. These particles caused Jc enhancement by an order of magnitude not only at 77 K but also at 90 K. As a result, we could levitate a permanent magnet over the (Nd, Eu, Gd)Ba2Cu3Oy superconductor cooled by liquid oxygen. This is a path to non-contact pumps of liquid oxygen for different fields of practice.

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