Highly crystalline single phase “2122”, Bi2CaSr2Cu2O8+δ, sample with δ=0.25 has been prepared from citrate precursors with pyrolysis. Stable and bulk superconductivity with T c(onset)=99 K and T c(zero)=95 K was reproducibly detected by the magnetic susceptibility and electrical resistivity measurements, respectively.
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Wang et al. (1989) studied this question.
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