Retrograde Densification of Calcined and Glass Precursors of Approximate (Bi,Pb)2Sr2Ca2Cu3O10 Stoichiometry |
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Authors: | Dimitri N Argyriou Eric R Vance |
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Affiliation: | Australian Nuclear Science and Technology Organisation, Menai, New South Wales 2234, Australia |
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Abstract: | Retrograde densification of pelletized calcines and glasses having an approximate (Bi,Pb)2Sr2Ca2Cu3O10 starting stoichiometry and sintered at ~850°C can be described by first-order rate equations. Retrograde densification in the calcine precursors was largely due to the development of open pores, and was approximately proportional to the concentration of the (Bi,Pb)2Sr2CaCu3O10 phase. In the glasses, retrograde densification is mainly caused by porosity accompanying the growth of a needlelike Sr─Ca─Cu─O phase, together with (Bi,Pb)2Sr2Ca2Cu3O10 and (Bi,Pb)2Sr2CaCu2O8. |
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Keywords: | densification superconductors kinetics glass high temperature |
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