Abstract
Ba-addition effects on the superconducting properties and the formation of the high- T c phase in the Bi Pb Sr Ca Cu O system have been studied. Samples with nominal compositions of Bi:Pb:(Sr 1− x Ba x ):Ca:Cu=0.96:0.24:1.0:1.1:1.6 ( x =0 to 0.3) were heated at 850°C in air. The Ba-addition promotes the formation of the high- T c phase. T c increases from 106 K for Ba-free samples to 112 K for samples with low Ba contents. The Ba-addition leads to an increase in the c -axis length from 37.10 to 37.20 A. The Ba-substitution site has been discussed on the basis of the results concerning the Ba-doped 2201 phase.
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