Influence of Ag substrates on grain alignment and critical current density of Bi-2212 tape conductors

被引：0

作者：

Kumakura, H. ^{[1
]}

Kitaguchi, H. ^{[1
]}

Togano, K. ^{[1
]}

Muroga, T. ^{[1
]}

Sato, J. ^{[1
]}

Okada, M. ^{[1
]}

机构：

[1] Natl Research Inst for Metals, Ibaraki, Japan

来源：

IEEE Transactions on Applied Superconductivity | 1999年 / 9卷 / 2 II期

关键词：

Bismuth compounds - Coating techniques - Critical current density (superconductivity) - Crystal impurities - Crystal microstructure - Interfaces (materials) - Silver - Superconducting films - Surface roughness - Tapes - X ray diffraction;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

We investigated the influence of Ag substrate on the microstructure and Jc values of dip-coated Bi-2212/Ag tapes. The grain alignment of Bi-2212 in the oxide/Ag interface was much higher than that in the free surface of oxide. Jc increases with increasing oxide/Ag interface area and with decreasing oxide layer thickness, while Jc was almost independent of the free surface area. The smoothness of the Ag substrate is also an important factor. Micrometer-size roughness of the Ag substrate results in a decrease of Bi-2212 grain alignment and therefore Jc. Addition of alloying elements to the Ag also degrades the grain alignment of Bi-2212 and decreased Jc. Cold rolling before the heat treatment improved the grain alignment and enhanced Jc.

引用

页码：1804 / 1807