Substitution Effect of Rare Earth Elements for Y in Pb-Sr-Y-Ca-Cu-O with “1212” Structure

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Abstract
The superconducting transition temperature (T c) and lattice constants of “1212” lead cuprate, (Pb/Cu)Sr2(Ln/Ca)Cu2O z (Ln=Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu and Y), were investigated. (Pb0.75Cu0.25)Sr2(Ln0.4Ca0.6)Cu2O z ceramics were prepared by sintering at 1000°C for 1 h in oxygen. Obtained ceramics were annealed at 800°C for 24 h in oxygen and subsequently quenched. Linear correlation between lattice constants and ionic radii of Ln was observed in the “1212” phases. The T c value increased with decreasing ionic radii of Ln. The Ln=Lu sample exhibited a T c (zero resistivity) of 61 K in our oxperiments.