The influence of atmosphere (PO2=10−5–1 atm), temperature (T=810–890 °C) and time (6–60 h) on the formation of the Bi(Pb)2SrCa2Cu3O10 (110 K) phase in the Bi‐Pb‐Sr‐Ca‐Cu‐O high TC superconductor system of composition Bi:Pb:Sr::Ca:Cu=1.84:0.34:1.91:2.03:3.06 has been studied. The relationships between the fraction 110 K phase, heating atmosphere, temperature, and time have been mapped via experimental data.

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