The possibility of negative substitution (x) in melt-processed Gd1+xBa2-xCu3O7-δGdBCO bulk superconductors

被引：3
|
作者：
Shi, Y. [1 ]
Babu, N. H. [2 ]
Iida, K. [1 ]
Cardwell, D. A. [1 ]
机构：
[1] Univ Cambridge, Dept Engn, Irc Superconduct, Cambridge CB2 1PZ, England
[2] Brunel Univ, BCAST, Uxbridge UB8 3PH, Middx, England
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2008年 / 468卷 / 15-20期
基金：
英国工程与自然科学研究理事会;
关键词：
Gd-163; solid solution; Gd1+xBa2-xCu3O7-delta; negative x; EPMA;
D O I：
10.1016/j.physc.2008.05.126
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have reported previously the successful fabrication of single grain Gd-Ba-Cu-O (GdBCO) bulk superconductors in air by top seeded melt growth (TSMG) using a generic Mg-Nd-Ba-Cu-O (Mg-NdBCO) seed crystal. Here, we report a new processing route that enables the fabrication of bulk GdBCO single grains in air using precursors with higher Ba content than has been achieved in previous studies. In particular, the composition of the superconducting matrix of single grains prepared with high, but varying, levels of Ba is analyzed by EPMA. The degree of substitution Ba for Gd (corresponding to a negative value of x in the composition formulation), in GdBCO is proposed for the first time based on the superconducting, compositional, chemical and structural properties of the Gd-123ss (Gd1+xBa2-xCU3O7-delta) phase matrix observed this study. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：1408 / 1410
页数：3
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