Patents relating to production of bulk ternary LRE-Ba 2Cu 3O y materials intended for applications at high magnetic fields and temperatures

Muralidhar Miryala, Milos Jirsa, Masaru Tomita

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Abstract

In this patent review the progress in technology and prospects of bulk ternary LRE-Ba 2Cu 3O y 'LRE-123' (LRE=light rare earth, Nd, Eu, Sm, Gd) superconductors are presented. Number of experiments has proven that ternary LRE-123 melt processed materials exhibit excellent properties appropriate for development of bulk high-field high-T c superconducting magnets. The key prerequisite for success in controlling flux pinning in these materials at high magnetic fields is creation of pinning defects with distinct superconducting properties compared to the superconducting matrix. In (Nd,Eu,Gd)-123 critical current density achieved the level of 10 5A/cm 2 at 65K in self-field and 5T and the irreversibility field B irr (the field limit above which the superconductor looses its ability to carry electric current) approached 15T at 77K. The high critical current density at low and intermediate fields, persisting up to the boiling point of liquid oxygen (90.2K), close to T c, is mainly due to size reduction of normal-conducting or insulating pinning defects up to nanoscale level. Such pinning sites are e.g. nanoscale secondary phase particles, Zr-, Nb-, Mo-, or Ti-oxides. In some particular (Nd,Eu,Gd)-123 compositions B irr increased twice due to a nanoscale planar substructure correlated with the regular twin structure.

Original languageEnglish
Pages (from-to)4-17
Number of pages14
JournalRecent Patents on Materials Science
Volume5
Issue number1
Publication statusPublished - 2012 Jan
Externally publishedYes

Fingerprint

Superconducting materials
Magnetic fields
Flux pinning
Defects
Superconducting magnets
Boiling point
Electric currents
Oxides
Rare earths
Oxygen
Temperature
Liquids
Chemical analysis
Experiments

Keywords

  • Critical current density
  • Flux pinning
  • Levitation at 90.2K
  • Mesoscopic defects
  • Micro-structure
  • Ternary LRE-123 compounds

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

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abstract = "In this patent review the progress in technology and prospects of bulk ternary LRE-Ba 2Cu 3O y 'LRE-123' (LRE=light rare earth, Nd, Eu, Sm, Gd) superconductors are presented. Number of experiments has proven that ternary LRE-123 melt processed materials exhibit excellent properties appropriate for development of bulk high-field high-T c superconducting magnets. The key prerequisite for success in controlling flux pinning in these materials at high magnetic fields is creation of pinning defects with distinct superconducting properties compared to the superconducting matrix. In (Nd,Eu,Gd)-123 critical current density achieved the level of 10 5A/cm 2 at 65K in self-field and 5T and the irreversibility field B irr (the field limit above which the superconductor looses its ability to carry electric current) approached 15T at 77K. The high critical current density at low and intermediate fields, persisting up to the boiling point of liquid oxygen (90.2K), close to T c, is mainly due to size reduction of normal-conducting or insulating pinning defects up to nanoscale level. Such pinning sites are e.g. nanoscale secondary phase particles, Zr-, Nb-, Mo-, or Ti-oxides. In some particular (Nd,Eu,Gd)-123 compositions B irr increased twice due to a nanoscale planar substructure correlated with the regular twin structure.",
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