Abstract
Formation of the high-Tc phase in the (Bi, Pb)-Sr-Ca-Cu-O system was studied using specimens with various Bi/Pb ratios. The synthesis temperature was suppressed as the Pb/(Pb+Bi) was increased. The lattice constant of the c axis of the low-Tc phase (Tc∼80 K) and high-Tc phase (Tc∼105 K) increased with increasing Pb content. Substitution of 30% Pb for Bi was found to be most preferential for the formation of the high-Tc phase.
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