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Retrograde Densification of Calcined and Glass Precursors of Approximate (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10 Stoichiometry
Author(s) -
Argyriou Dimitri N.,
Vance Eric R.
Publication year - 1992
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.1151-2916.1992.tb05568.x
Subject(s) - stoichiometry , calcination , porosity , mineralogy , phase (matter) , materials science , analytical chemistry (journal) , sintering , crystallography , chemistry , metallurgy , composite material , catalysis , organic chemistry , chromatography , biochemistry
Retrograde densification of pelletized calcines and glasses having an approximate (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10 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) 2 Sr 2 CaCu 3 O 10 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) 2 Sr 2 Ca 2 Cu 3 O 10 and (Bi,Pb) 2 Sr 2 CaCu 2 O 8 .