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2004
Bismuth
I 5400
47- 017
New Aluminate with a Tetrahedral Structure Closely Related to the C84 Fullerene.
— Single crystals of a new aluminate of composition Sr33 Bi24+δAl48O141+3δ/2 with
δ ≅ 0.25 are prepared by solid state reaction of Bi 2O3, SrO2, and Al2O3 (evacuated silica
tube, 1200 °C, 48 h). The compound crystallizes in the cubic space group F43m with
Z = 4 and forms a close packed face-centered cubic array of Al84 fullerene geometry.
The structure consists of corner-sharing AlO4 tetrahedra forming Al84O106 cubic units
whose assemblage delimits five types of cages, three of them being empty, one being
occupied by strontium, and the fifth one forming the huge spheric fullerene-type cavity.
In the latter, strontium, oxygen, and bismuth ions form concentric spheres, with an
onion-skin-like configuration. The latter ions are disposed into a compact anion whose
exceptional geometry is characterized by a strong stereoactivity of the 6s2 lone pair of
Bi3+. — (BOUDIN*, S.; MELLENNE, B.; RETOUX, R.; HERVIEU, M.; RAVEAU,
B.; Inorg. Chem. 43 (2004) 19, 5954-5960; Lab. Cristallogr. Sci. Mater., CNRS, Ec.
Natl. Super. Ing., F-14050 Caen, Fr.; Eng.) — Schramke
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