Patents relating to production of bulk ternary LRE-Ba2Cu3Oy materials intended for applications at high magnetic fields and temperatures

Miryala Muralidhar, Milos Jirsa, Masaru Tomita

Research output: Contribution to journalReview articlepeer-review

7 Citations (Scopus)


In this patent review the progress in technology and prospects of bulk ternary LRE-Ba2Cu3Oy '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-Tc 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 105A/cm2 at 65K in self-field and 5T and the irreversibility field Birr (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 Tc, 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 Birr 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
Issue number1
Publication statusPublished - 2012 Jan
Externally publishedYes


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

ASJC Scopus subject areas

  • Materials Science(all)


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