Dendrite formation in the Bi2Sr2CaCu2O8-Ag system: reactions between Ag and oxide melt

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The reactions between Ag and oxide melt in the Bi2Sr2CaCU2O8-Ag system have been investigated. When an Ag sheath reacts with the oxide melt, two kinds of dendritic phases are formed near the Ag sheath. One dendrite with the composition of Ag0.98CU0.02 was large, 1-100 mum, and more or less spherical in overall shape. The other dendrite with the composition of approximately Ag0.24Cu0.76 was small, 0.1-1 Irm, and typically dendritic. The small dendrites formed always along the Bi2Sr2CaCu2O8 superconducting plates. When the sample was heat treated at 70 degreesC in air, the dendrite shape changed from smooth to faceted, and the color from white to yellowish red for the large dendrite and from white to dark green for the small one. These observations imply that the dendrites were metallic at high temperature but oxidized during the heat treatment at 70 degreesC. The formation of the two kinds of dendrites is attributed to the separation of the Bi melt into metallic and oxide liquids due to a miscibility gap. The formation of the Ag-Cu dendritic phases also seems to be responsible for the inhomogeneous microstructure, which is commonly observed between an Ag sheath and the central ceramic region, because the dendrite formation must cause inhomogeneous liquid composition in the sample. (C) 2000 Elsevier Science B.V, All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2000-12
Language
English
Article Type
Article
Keywords

CA-CU-O; PHASE-EQUILIBRIA; HEAT-TREATMENT; TAPES; SILVER; SUPERCONDUCTIVITY; MICROSTRUCTURE; INTERFACE; ADDITIONS; DIAGRAM

Citation

PHYSICA C, v.340, no.2-3, pp.141 - 148

ISSN
0921-4534
URI
http://hdl.handle.net/10203/76350
Appears in Collection
MS-Journal Papers(저널논문)
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