AC Loss Characteristics in Bi2223/Ag Tapes With Interfilamentary Oxide Barriers for Filament Decoupling

Author

Inada, R. ; Fukumoto, Y. ; Yasunami, T. ; Nakamura, Y. ; Oota, A. ; Li, C.S. ; Zhang, P.X.

Author_Institution

Toyohashi Univ. of Technol., Toyohashi

Volume

18

Issue

2

fYear

2008

fDate

6/1/2008 12:00:00 AM

Firstpage

1163

Lastpage

1166

Abstract

In this paper, we prepared Bi2223/Ag tapes with interfilamentary oxide barriers for filament decoupling and also for reducing AC losses under AC external magnetic field. To suppress the side effect on Bi2223 phase formation inside the filaments and superconducting properties in final tapes by introducing oxide barriers, we selected Ca₂CuO₃ as barrier materials. In addition, the 30 wt% Bi2212 powders were mixed into Ca₂CuO₃, to improve their deformation properties for cold working such as drawing and flat rolling. The mixtures of Ca₂CuO₃ and Bi2212 were introduced around the twisted Bi2223 filaments. AC losses in barrier tapes under parallel transverse magnetic field were measured at 77 K, and compared with the several analytical models. Based on the results, the effect of barrier introduction on the AC loss characteristics in twisted multifilamentary tape is discussed.

Keywords

bismuth compounds; calcium compounds; cold working; deformation; drawing (mechanical); high-temperature superconductors; lead compounds; magnetic leakage; multifilamentary superconductors; strontium compounds; superconducting tapes; AC external magnetic field; AC losses; Bi₂PbSr₂Ca₂Cu₃O₁₀; cold working; deformation; drawing; filament decoupling; flat rolling; interfilamentary oxide barriers; superconducting properties; temperature 77 K; twisted multifilamentary tapes; AC loss; Bi2223 tapes; barriers; filament coupling; twisting;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2008.920540

Filename

4515894