Structural and compositional defects in high-Jc, Bi-2223 tapes

被引:25
作者
Holesinger, TG
Bingert, JF
Willis, JO
Li, Q
Parrella, RD
Teplitsky, MD
Rupich, MW
Riley, GN
机构
[1] Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[2] Amer Superconductor, Westborough, MA 01581 USA
关键词
D O I
10.1109/77.784969
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
High critical current density (J(c)) Bi-2223 multifilamentary tapes (55 kA/cm(2) less than or equal to J(c) less than or equal to 70 kA/cm(2), 77K and self-field) have been examined by transmission electron microscopy. Filament microstructures within the tapes consist of two distinct regions: a highly aligned,; dense colony structure (brick-wall) near the silver interface and a porous, poorly-textured interior region (impurity channel) that contains significantly more secondary phases. Quantitative compositional analysis clearly showed a heterogeneity in the Bi-2223 composition throughout the tapes. Spatial variations in composition were especially prevalent in the vicinity of secondary phases. Potential current limiting microstructures or defects were categorized depending upon the length scale at which they would operate. Macroscale defects were defined as potentially limiting current flow between regions of a filament. Mesoscale defects affect current flow between adjoining colonies, And finally, microscale defects were classified as potentially limiting current flow within a colony structure.
引用
收藏
页码:2440 / 2445
页数:6
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