1. Quantitative Electron Microscopy of (Bi,Pb)2Sr2Ca2Cu3O10 + δ/Ag Multifilament Tapes During Initial Stages of Annealing.
- Author
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Bals, Sara, Verbeeck, Jo, van Tendeloo, Gustaaf, Yi-Lin Liu, and Grivel, Jean-Claude
- Subjects
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SUPERCONDUCTORS , *ANNEALING of crystals , *TRANSMISSION electron microscopy , *MICROSTRUCTURE , *LIQUIDS , *CERAMICS - Abstract
The microstructural and compositional evolution during initial annealing of a superconducting (Bi,Pb)2Sr2Ca2Cu3O10+δ/Ag tape is studied using quantitative transmission electron microscopy. Special attention is devoted to the occurrence of Pb-rich liquids, which arc crucial for the Bi2Sr2CaCu2O8+&delta to (Bi,Pb)2Sr2Ca2Cu3O10+δ transformation, Ca and/or Pb-rich (Bi,Pb)2Sr2CaCu2O8+&delta grains dissolve into a liquid, which reacts with Ca-rich phases to increase the liquid's Ca-content. This leads to (Bi,Pb)2Sr2Ca2Cu3O10+δ formation. Apparently, a Ca/Sr ratio of around I is sufficient to keep (Bi,Pb)2Sr2Ca2Cu3O10+δ a nucleation going. It is confirmed that Ag particles are transported from the Ag-sheath into the oxide core by the liquid and not by mechanical treatment of the tape. [ABSTRACT FROM AUTHOR]
- Published
- 2005
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