Processing of Ag-doped Bi2212 bulks in high magnetic fields: a strong correlation between degree of texture and field strength

被引:23
作者
Chen, WP [1 ]
Maeda, H
Kakimoto, K
Zhang, PX
Watanabe, K
Motokawa, M
机构
[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[2] CREST, Japan Sci & Technol, Tsukuba, Ibaraki 3050047, Japan
来源
PHYSICA C | 1999年 / 320卷 / 1-2期
基金
日本科学技术振兴机构;
关键词
Bi2212; texture; magnetic field; critical current density; melt processing;
D O I
10.1016/S0921-4534(99)00320-2
中图分类号
O59 [应用物理学];
学科分类号
摘要
A series of high magnetic fields up to 9 T have been applied to the preparation of Ag-doped Bi2212 bulks and a strong correlation is observed between the field strength and the degree of texture developed in the bulks. Two powders of Bi2.2Sr1.8CuOx and CaCuO2 were synthesized separately and then 10 wt.% Ag was doped to their equimolar mixture, from which the Bi2212 bulks were formed by a partial melt-solidification process in the high magnetic fields. The degree of texture in the bulks was evaluated quantitatively by X-ray diffraction and magnetization measurement. It is found that the applied magnetic fields tend to orient Bi2212 grains with their c-axis parallel to them and obvious texture exists in all samples prepared in the magnetic fields; while in samples prepared without magnetic field Bi2212 grains orient randomly. In the field range of 0-9 T, the degree of texture increases notably with increasing the magnetic field. In 9 T Bi2212, bulks with magnetization anisotropy factor more than four and a density of 6.15 g/cm(3) are obtained and SEM observation also shows a highly oriented grain alignment. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码:96 / 100
页数:5
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