ISSN:
1573-8779
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The symmetry, composition, and crystal structure of Cs6.3W11O36 (a=7.2742, c=110.79 Å, Z=6, $$R\bar 3c$$ , R=0.057), previously considered monoclinic and stoichiometric, are refined. The tungsten-oxygen octahedral units of the structure, which have an AB2O6 defective pyrochlore motif, lie in layers perpendicular to the c axis, with Cs+ ions located in the voids of layer units and between them. An additional interlayer position of cesium, occupied by 31(8)%, has been found. The structures of Cs8.5W11O48 and defective pyrochlore, related to Cs6+xW11O36, form a homologous series with the general formula A2nA′ 1−yM4n−1X12n (for the above members, n=3,4 and ∞, respectively); the members in the series differ in the number of storeys in pyrochlore-like layers.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02437180
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