Kinetics of phase formation and transport properties of Bi-2223/Ag tapes fabricated by various calcined powders

Author

Jiang, Chunhai ; Yoo, Jaimoo ; Ko, Jaewoong ; Chung, Hyungsik ; Qiao, Guiwen

Author_Institution

Inst. of Metal Res., Chinese Acad. of Sci., Shenyang, China

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

2937

Lastpage

2940

Abstract

The kinetics of phase formation and transport properties of Bi-2223/Ag tapes fabricated by precursor powders with different phase assemblages have been studied. Our results show that the formation process of 2223 phase is strongly related to the secondary phases in precursors. A variation of the reaction-order, n, deduced from the Avrami relation, was observed along with the whole sintering processing. Within a sintering period of 65 h, n keeps the value of 0.7 for the tape made from the powder calcined at 830°C, while it changes from 0.3 or 0.4 to 1 for the tapes prepared with the powders calcined at 810°C and 820°C. Based on the analysis of phase formation and transport properties, the optimum calcination conditions for achieving high J_c tapes are discussed.

Keywords

bismuth compounds; calcium compounds; critical current density (superconductivity); high-temperature superconductors; multifilamentary superconductors; phase diagrams; silver; sintering; strontium compounds; superconducting tapes; 65 h; 810 degC; 820 degC; 830 C; Avrami relation; Bi-2223/Ag tapes; Bi₂Sr₂Ca₂Cu₃O₁₀-Ag; calcined powders; critical current density; phase assemblages; phase formation; reaction-order; secondary phases; sintering processing; transport properties; Assembly; Calcination; Kinetic theory; Machinery; Materials science and technology; Microstructure; Powders; Proposals; Research and development; Superconductivity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.812060

Filename

1212238