H. Sasakura et al., SUPERCONDUCTIVITY IN PB-SUBSTITUTED BI-2222 COMPOUNDS - (BI,PB)(2)SR-2(RE,CE)(2)CU2OZ (RE=ND,SM,EU,GD AND Y), Czechoslovak journal of Physics, 46, 1996, pp. 1475-1476
We report that Pb-partially substituted Bi-2222 samples of (Bi,Pb)(2)S
r-2(RE,Ce)(2)Cu2Oz (RE=Nd, Sm, Eu, Gd and Y) easily show superconducti
vity after annealing under 1 atm O-2 atmosphere. Especially, in the Bi
-2222 samples of RE=Eu, an almost the single phase sample of Bi1.5Pb0.
5Sr2Eu1.65Ce0.35Cu2Oz shows the highest superconducting onset at about
40K. Moreover, when RE element changes for the samples with the nomin
al composition of Bi(1.5)Pb(0.5)Sr(2)RE(1.65)Ce(0.35)Cu(2)O, the T-c v
alues seems to vary correratively with the lattice parameters of c.