Critical Current Characteristics of Bi2212 Round Wires Prepared by Isothermal Partial Melting Method

Author

Takahashi, Ken-Ichiro ; Nakane, Takayuki ; Matsumoto, Akiyoshi ; Kitaguchi, Hitoshi ; Kumakura, Hiroaki

Author_Institution

Nat. Inst. for Mater. Sci. (NIMS), Tsukuba, Japan

Volume

19

Issue

3

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

3067

Lastpage

3070

Abstract

We prepared Bi2212 round wires using the isothermal partial melting process, in which partial melting and solidification are carried out at the same temperature but in changing oxygen partial pressure. We found that the homogeneity of Bi2212 phase inside the wire was important for the J _c performance of the wire and the homogeneity was improved by extending the heat treatment time. The J _c value of 6.6times10⁴ A/cm² at 4.2 K and 10 T were obtained. We can expect further enhancement of J _c property by optimizing the heat treatment conditions and improving the homogeneity of Bi2212 filaments of the wires.

Keywords

bismuth compounds; calcium compounds; critical current density (superconductivity); heat treatment; high-temperature superconductors; melting; solidification; strontium compounds; Bi2212 filaments; Bi2212 round wires; Bi₂Sr₂CaCu₂O_x; critical current; heat treatment time; isothermal partial melting; oxygen partial pressure; solidification; Bi2212/Ag round wire; critical current density; melt-solidification; oxygen partial pressure;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2009.2018210

Filename

5153245