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Through careful selection of reduction conditions it is found that both BaPbO₃ and Ba₄{Pb}₃O₁₀ can be prepared with significant amounts of oxygen deficiency. In both cases, crystallographic unit cells and resistivities change with oxygen content. Hall-effect measurements, however, indicate that the oxygen nonstoichiometry does not change the mobile-carrier concentration, suggesting that the electrons introduced are strongly trapped. The oxygen-deficient materials BaPbO2.90 and Ba₄{Pb}₃O9.86 are not superconducting down to 70 mK.
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Cava et al. (1993) studied this question.
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