MELT PROCESSING FOR OBTAINING REBA(2)CU(3)O(Y) SUPERCONDUCTORS (RE=ND, SM) WITH HIGH T-C AND LARGE J(C)

被引：49

作者：

YOO, SI

SAKAI, N

HIGUCHI, T

MURAKAMI, M

机构：

[1] Superconductivity Research Laboratory, International Superconductivity Technology Center, Tokyo

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1995年 / 5卷 / 02期

关键词：

D O I：

10.1109/77.402872

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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 (T-c) with a sharp transition and large critical current density (J(c)) 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 T-c phase in a low oxygen partial pressure (P-O2) could be qualitatively described considering the thermodynamic stability boundaries of the Nd1+xBa2-xCu3Oy solid solutions on the LOG[P-O2] 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 degrees C.

引用

页码：1568 / 1571

页数：4

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