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Quantitative Electron Microscopy of (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10+δ /Ag Multifilament Tapes During Initial Stages of Annealing
Author(s) -
Bals Sara,
Verbeeck Jo,
Van Tendeloo Gustaaf,
Liu YiLin,
Grivel JeanClaude
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00094.x
Subject(s) - annealing (glass) , transmission electron microscopy , nucleation , superconductivity , materials science , analytical chemistry (journal) , electron microscope , mineralogy , crystallography , chemistry , metallurgy , nanotechnology , condensed matter physics , physics , organic chemistry , chromatography , optics
The microstructural and compositional evolution during initial annealing of a superconducting (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10+δ /Ag tape is studied using quantitative transmission electron microscopy. Special attention is devoted to the occurrence of Pb‐rich liquids, which are crucial for the Bi 2 Sr 2 CaCu 2 O 8+δ to (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10+δ transformation. Ca and/or Pb‐rich (Bi,Pb) 2 Sr 2 CaCu 2 O 8+δ grains dissolve into a liquid, which reacts with Ca‐rich phases to increase the liquid's Ca‐content. This leads to (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10+δ formation. Apparently, a Ca/Sr ratio of around 1 is sufficient to keep (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10+δ 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.