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Title: Rapid formation of the 110 K phase in Bi-Pb-Sr-Ca-Cu-O through freeze-drying powder processing

Abstract

This paper reports three techniques for processing Bi-Pb-Sr-Ca-Cu-O (BPSCCO) powders investigated: dry-mixing, sol-gel formation, and freeze-drying. It was found that sintering for 120 h at 850{degrees}C is required to form nearly single-phase (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10{minus}{ital y}} by dry-mixing, whereas sintering for 30 h at 840{degrees}C was sufficient to form the 110 K (2223) phase when freeze-drying was used. The sol-gel route was found to be intermediate in efficiency between these two techniques. Freeze-drying provided highly reactive, intimately mixed, and carbon-free precursors. The presence of carbonates in the uncalcined powders was the major cause of phase segregation and sluggishness of the 110 K phase formation.

Authors:
; ; ;  [1]
  1. School of Materials Science and Engineering, Univ. of New South Wales, Kensington, New South Wales 2033 (AU)
Publication Date:
OSTI Identifier:
6484019
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society; (USA)
Additional Journal Information:
Journal Volume: 73:6; Journal ID: ISSN 0002-7820
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BISMUTH COMPOUNDS; FREEZING; HIGH-TC SUPERCONDUCTORS; FABRICATION; CALCIUM OXIDES; CHEMICAL COMPOSITION; COPPER OXIDES; LEAD OXIDES; MIXTURES; PHASE STUDIES; POWDER METALLURGY; PRECURSOR; SINTERING; SOL-GEL PROCESS; STRONTIUM OXIDES; ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; DISPERSIONS; LEAD COMPOUNDS; METALLURGY; OXIDES; OXYGEN COMPOUNDS; STRONTIUM COMPOUNDS; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS; 360202* - Ceramics, Cermets, & Refractories- Structure & Phase Studies; 426001 - Engineering- Superconducting Devices & Circuits- (1990-); 360201 - Ceramics, Cermets, & Refractories- Preparation & Fabrication; 656100 - Condensed Matter Physics- Superconductivity

Citation Formats

Song, K H, Liu, H K, Dou, S X, and Sorrell, C C. Rapid formation of the 110 K phase in Bi-Pb-Sr-Ca-Cu-O through freeze-drying powder processing. United States: N. p., 1990. Web. doi:10.1111/j.1151-2916.1990.tb09830.x.
Song, K H, Liu, H K, Dou, S X, & Sorrell, C C. Rapid formation of the 110 K phase in Bi-Pb-Sr-Ca-Cu-O through freeze-drying powder processing. United States. doi:10.1111/j.1151-2916.1990.tb09830.x.
Song, K H, Liu, H K, Dou, S X, and Sorrell, C C. Fri . "Rapid formation of the 110 K phase in Bi-Pb-Sr-Ca-Cu-O through freeze-drying powder processing". United States. doi:10.1111/j.1151-2916.1990.tb09830.x.
@article{osti_6484019,
title = {Rapid formation of the 110 K phase in Bi-Pb-Sr-Ca-Cu-O through freeze-drying powder processing},
author = {Song, K H and Liu, H K and Dou, S X and Sorrell, C C},
abstractNote = {This paper reports three techniques for processing Bi-Pb-Sr-Ca-Cu-O (BPSCCO) powders investigated: dry-mixing, sol-gel formation, and freeze-drying. It was found that sintering for 120 h at 850{degrees}C is required to form nearly single-phase (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10{minus}{ital y}} by dry-mixing, whereas sintering for 30 h at 840{degrees}C was sufficient to form the 110 K (2223) phase when freeze-drying was used. The sol-gel route was found to be intermediate in efficiency between these two techniques. Freeze-drying provided highly reactive, intimately mixed, and carbon-free precursors. The presence of carbonates in the uncalcined powders was the major cause of phase segregation and sluggishness of the 110 K phase formation.},
doi = {10.1111/j.1151-2916.1990.tb09830.x},
journal = {Journal of the American Ceramic Society; (USA)},
issn = {0002-7820},
number = ,
volume = 73:6,
place = {United States},
year = {1990},
month = {6}
}