Phase relations study on the melting and crystallization regions of the Bi-2223 high temperature superconductor

Materials Research

Alexander Polasek²  Peter Majewski¹  Eduardo Torres Serra²  Fernando Rizzo¹  Fritz Aldinger¹ 

[1] ,Electric Power Research CenterRio de Janeiro RJ ,Brazil

关键词: high temperature superconductors;    Bi-2223;    melting and crystallization;   

DOI  :  10.1590/S1516-14392004000300005

来源: SciELO

【 摘 要 】

The melting and solidification behavior of Bi2Sr2Ca2Cu3 O10 (Bi-2223) precursors has been studied. Nominal compositions corresponding to excess of liquid, Ca2CuO3 and CuO have been investigated. Each sample was made by packing a precursor powder into a silver crucible, in order to approximately simulate the situation found in 2223 silver-sheathed tapes. The samples were partially melted and then slow-cooled, being quenched from different temperatures and analyzed through X-ray diffraction (XRD) and scanning electron microscopy (SEM/EDS). The precursors decomposed peritectically during melting, forming liquid and solid phases. Very long plates with compositions falling in the vicinity of the 2223 primary phase field formed upon slow-cooling. The 2223 phase may have been formed and the results suggest that long grains of this phase might be obtained by melting and crystallization if the exact peritectic region and the optimum processing conditions are found.

【 授权许可】

CC BY   
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