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

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

doi:10.1088/0953-2048/18/2/011

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

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

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We report on a new type of nanometre-scale pinning defect in melt-processed (Nd, Eu, Gd)Ba₂Cu₃O_y, '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 J_c 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 language	English
Pages (from-to)	S47-S51
Journal	Superconductor Science and Technology
Volume	18
Issue number	2
DOIs	https://doi.org/10.1088/0953-2048/18/2/011
Publication status	Published - 2005 Feb 1

ASJC Scopus subject areas

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

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10.1088/0953-2048/18/2/011

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.",

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AU - Muralidhar, M.

AU - Sakai, N.

AU - Jirsa, M.

AU - Murakami, M.

AU - Koshizuka, N.

PY - 2005/2/1

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

Abstract

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