Single-phase samples of (Ba1-xKx)(Bi1-xSby)O3 have been synthesized over a limited compositional range using a two-step procedure: high-temperature firing in a low oxygen partial pressure followed by low-temperature oxygen annealing. For y=0 and 0.37<x<0.50, samples have a simple cubic structure and are bulk superconductors with Tc gradually decreasing from 30 to 22K as x increases to 0.50. For fixed x and y>0 samples are superconducting again with a simple cubic structure and with Tc gradually decreasing as y increases.
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Dabrowski, B., Pei, S., Richards, D.R. et al. Superconducting and Structural Properties of the (Ba0.6K0.4) (Bi1-YSbY)O3 System. MRS Online Proceedings Library 169, 153–156 (1989). https://doi.org/10.1557/PROC-169-153