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A new double perovskite-type bismuthate, (Ba0.75K0.14H0.11)BiO3·nH2O was prepared by low-temperature hydrothermal reaction. This compound had the double perovskite-type structure with a cubic cell of a = 0.85444(3) nm, in which the A site was occupied by Ba atoms, K atoms, and water molecules, and Bi atoms occupied one crystallographic site. This compound exhibited superconductive diamagnetism with an onset temperature of about 8 K.
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Jiang et al. (2009) studied this question.
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