Melt processing for obtaining REBa2Cu30y superconductors (RE= Nd, Sm) with high Tcand large Jc

S. I. Yoo; N. Sakai; T. Higuchi; M. Murakami

doi:10.1109/77.402872

Melt processing for obtaining REBa2Cu30y superconductors (RE= Nd, Sm) with high Tcand large Jc

S. I. Yoo, N. Sakai, T. Higuchi, M. Murakami

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

44 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 Tcphase 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 language	English
Pages (from-to)	1568-1571
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	5
Issue number	2
DOIs	https://doi.org/10.1109/77.402872
Publication status	Published - 1995 Jun
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "Melt processing for obtaining REBa2Cu30y superconductors (RE= Nd, Sm) with high Tcand large Jc",

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 Tcphase 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.",

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AU - Yoo, S. I.

AU - Sakai, N.

AU - Higuchi, T.

AU - Murakami, M.

PY - 1995/6

Y1 - 1995/6

N2 - 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 Tcphase 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.

AB - 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 Tcphase 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.

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Melt processing for obtaining REBa2Cu30y superconductors (RE= Nd, Sm) with high Tcand large Jc

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