Synthesis of bismuth-strontium-calcium-copper oxide powders for silver composite wires with uniform micron sized filaments

Author

Sengupta, S. ; Caprino, E. ; Card, K. ; Gaines, J.R., Jr. ; Motowidlo, L.R. ; Sokolowski, R.S. ; Garcia, R.R. ; Mukhopadyay, S.M.

Author_Institution

Supercond. Components Inc., Columbus, OH, USA

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

2601

Lastpage

2604

Abstract

A chemical precipitation method is utilized to synthesize bismuth-strontium-calcium-copper oxide powder. Tetra-methyl ammonium hydroxide and tetra-methyl ammonium carbonate are used as a precipitant and for pH adjustment. Effect of processing parameters like carbonization time, and cation solution concentration on Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/ (Bi-2212) powders is reported. Powders with different particle size and distribution are used to fabricate Ag sheathed multifilamentary Bi-2212 round wires with diameter about 0.06 cm (corresponding to filament diameter about 3 /spl mu/m). Significant sausaging was observed for wires processed with larger particle size powders. Good filament uniformity was observed for wires produced from finer powders.

Keywords

bismuth compounds; calcium compounds; high-temperature superconductors; particle size; powder technology; precipitation; strontium compounds; 0.06 cm; 3 mum; Bi-2212 powders; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/; bismuth-strontium-calcium-copper oxide powder; bismuth-strontium-calcium-copper oxide powder synthesis; carbonization time; cation solution concentration; chemical precipitation method; filament diameter; finer powders; good filament uniformity; multifilamentary Bi-2212 round wires; pH adjustment; particle size; particle size powders; processing parameters; sausaging; silver composite wires; tetra-methyl ammonium carbonate; tetra-methyl ammonium hydroxide; uniform micron sized filaments; Bismuth compounds; Chemical engineering; Copper; Inductors; Powders; Silver; Strontium; Superconducting materials; Superconductivity; Wires;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.785019

Filename

785019