Melt processing for obtaining REBa2Cu3Oy superconductors (RE= Nd, Sm) with high Tc and large Jc

S. I. Yoo, Naomichi Sakai, T. Higuchi, Masato Murakami

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Abstract

An oxygen-controlled melt growth (OCMG) process has been employed for NdBa2Cu3Oy (Nd123) and SmBa2Cu3Oy (Sm123) superconductors for a comparative study. Both Nd123 and Sm123 samples melt-grown in reduced oxygen atmospheres exhibited an enhanced superconducting transition temperature (Tc) with a sharp transition and large critical current density (Jc) in a high field region at 77 K and for the applied field parallel to the c-axis of samples (H//c). For Nd123, a preferential formation of high Tc phase in a low oxygen partial pressure (PO2) could be qualitatively described considering the thermodynamic stability boundaries of the Nd1+xBa2-xCu3Oy solid solutions on the LOG[PO2] vs 1/T (K-1) phase diagram. A long-term oxygen annealing study for an OCMG-processed Nd123 sample revealed that the annealing temperature should be as low as 300°C.

Original languageEnglish
Pages (from-to)1568-1571
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume5
Issue number2 pt 2
Publication statusPublished - 1995 Jun
Externally publishedYes

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ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

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