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

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

Research output: Contribution to journalArticle

37 Citations (Scopus)

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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Superconducting materials
Oxygen
oxygen
Processing
Annealing
annealing
Partial pressure
Superconducting transition temperature
Phase diagrams
partial pressure
Solid solutions
critical current
Thermodynamic stability
solid solutions
transition temperature
phase diagrams
current density
atmospheres
thermodynamics
Temperature

ASJC Scopus subject areas

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

Cite this

Melt processing for obtaining REBa2Cu3Oy superconductors (RE= Nd, Sm) with high Tc and large Jc. / Yoo, S. I.; Sakai, Naomichi; Higuchi, T.; Murakami, Masato.

In: IEEE Transactions on Applied Superconductivity, Vol. 5, No. 2 pt 2, 06.1995, p. 1568-1571.

Research output: Contribution to journalArticle

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