Potassium barium bismuth oxide.
KBa(4)Bi(3)O crystallizes in the centrosymmetric tetragonal space group I4/mcm. In this compound, bismuth is present as two anionic species, i.e. Bi(2)(4-) dumbbells [Bi-Bi 3.113 (3) A] and isolated Bi(3-). Atom Bi1 (Bi(3-)) lies inside a bicapped square antiprism (2 x K and 8 x Ba). Atom Bi2, which forms the Bi(2)(4-) dumbbell, sits inside a bicapped distorted trigonal prism (2 x K and 6 x Ba). O atoms occupy tetrahedral voids between Ba atoms.
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Laboratoire des Agrégats Moléculaires et Matériaux Inorganiques, UMR 5072 CC15, Université des Sciences et Techniques du Languedoc, 2 Place Eugène Bataillon, 34095 Montpellier CEDEX 5, France.
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