Orientation distribution of grain planes in polycrystal Ag/Bi-2223 tape

被引:7
作者
Chen, WM [1 ]
Wang, F
Lin, F
Jiang, SS
Guo, YC
Liu, HK
Dou, SX
机构
[1] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia
[2] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
[3] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
来源
JOURNAL OF SUPERCONDUCTIVITY | 2000年 / 13卷 / 03期
关键词
Bi2223; tapes; grain orientation; critical current density; microstructure;
D O I
10.1023/A:1007711310818
中图分类号
O59 [应用物理学];
学科分类号
摘要
For polycrystalline Ag/Bi-2223 tapes, the preferential orientation of grains is a very important issue. The platelike grains in the tapes are generally believed in a high-order alignment. However, microstructural observation by SEM shows that the grain alignment is far from perfect. Theoretically, upper critical field, H-c2, for H parallel to ab plane and 0 axis was calculated form the relation of IM(H). However, the ratio of H-c2 ((H//ab)) to H-c2(H//c) depends on the angle (theta) between the ab plane of grains and the broad surface of the tapes; Based on the ratio, the orientation distribution of grains is obtained. The results show that grains in Ag/Bi-2223 tapes can grow with ab plans at any angle between 75 degrees > theta > -75 degrees, but no grain can grow with its ab plane perpendicular to the tape broad surface. The overall distribution is that: > 90% grains orient in the angle range of /theta/ < +/- 75 degrees, about 5% grains at +/- 75 degrees less than or equal to /theta/ less than or equal to +/- 85 degrees, and no grains at /theta/ > +/- 85 degrees.
引用
收藏
页码:441 / 446
页数:6
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