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Fast Solution Precursor Synthesis of the 2223 Phase: the Role ofLead in the Reaction Pathway
Published online by Cambridge University Press: 21 February 2011
Abstract
Valuable mechanistic information, about the reaction pathway in theformation of the 2223 phase, has been obtained by the use of a solutionsynthesis route. The presence of lead in the starting mixture has remarkableeffects on the nature and stability of the different intermediates: i) thegrain size and morphology of Bi2CuO4 is severelychanged, ii) calcium carbonate is partially decomposed to yield the calciumplumbate, iii) the 2201 phase results stabilized against the formation ofthe collapsed phase Bi17Sr16Cu7O49-δ, iv) themelting point of the intermediate 2212 is lowered by about 10 °C. All theseeffects, due to lead substitution, contribute to promote the formation ofthe 2223 phase, controlling also the morphology and properties of the finalproduct.
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