DISTRIBUTION OF THE TRANSPORT CRITICAL CURRENT IN Ag-(Bi,Pb)(2)Sr2Ca2Cu3Ox REINFORCED TAPE-FORM CONDUCTORS

被引：15

作者：

Glowacki, B. A. ^{[1
,2
]}

Lo, W. ^{[1
]}

Yuan, J. ^{[1
]}

Jackiewicz, J. ^{[1
]}

Liang, W. Y. ^{[1
]}

机构：

[1] Univ Cambridge, Irc Superconduct, Madingley Rd, Cambridge CB3 0HE, England

[2] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3 0HE, England

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1993年 / 3卷 / 01期

关键词：

D O I：

10.1109/77.233854

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：

The spatial distribution of the transport critical current, Ic, in the reinforced tape-form, silver- clad Ag-(Bi,Pb)(2)Sr2Ca2Cu3Ox conductor manufactured by cold multi-step rolling technique, has been established by the in situ Ic measurements versus thickness of the ceramic core. The critical current measurements prove that supercurrent is almost uniformly distributed through the whole cross-section of the ceramic core in the wire, almost independently on the initial Ic value of the investigated tape. The effect of densification, texturing and surface diffusion on the formation of the intergrain connectivity along the a-b plane of the ceramic core, at the silver-ceramic interface and in the ceramic core, has been investigated and discussed in detail. The transport Ic anisotropy measurements and ASC study of magnetically aligned samples and randomly oriented samples enable us to establish a functional relation between the crystallographic orientation, morphology and connectivity of the grains in the tape form conductor. The variation of the hole concentration near the grain boundary region of the "2223" phase has been investigated by transmission electron energy loss spectroscopy.

引用

页码：953 / 956

页数：4

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