Improved superconducting properties of melt-textured Nd123 by additional heat treatment

被引：33

作者：

Chikumoto, N ^{[1
]}

Yoshioka, J ^{[1
]}

Murakami, M ^{[1
]}

机构：

[1] ISTEC, Int Superconduct Technol Ctr, Superconduct Res Lab, Minato Ku, Tokyo 105, Japan

来源：

PHYSICA C | 1997年 / 291卷 / 1-2期

关键词：

Nd-Ba-Cu-O; melt process; heat-treatment; critical current density; critical temperature;

D O I：

10.1016/S0921-4534(97)01705-X

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have investigated the effect of additional heat-treatment on the superconducting transition and the flux pinning properties of Nd-Ba-Cu-O melt-textured in air. After the heat-treatment at high temperatures, > 900 degrees C, under low oxygen partial pressure, P(O-2) = 0.001 atm, the superconducting transition became sharper accompanied by an increase of J(c). However, the increase of J(c) was very small and the secondary peak effect commonly observed in Nd-Ba-Cu-O melt textured in low P(O-2) could not be observed. Transmission electron microscopic observations and energy dispersive X-ray analyses show that the spatial variation of the Nd/Ba ratio is reduced after high-temperature heat-treatment, which indicates that an improvement in T-c and J(c) is attributed to a suppression of Nd substitution on the Ba site. (C) 1997 Elsevier Science B.V.

引用

页码：79 / 84

页数：6

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