A Novel Family of Layered Bismuth Compounds: I. The Crystal Structures of Pb0.6Bi1.4Cs0.6O2Cl2 and Pb0.6Bi3.4Cs0.6O4Cl4

✍ Scribed by D.O. Charkin; P.S. Berdonosov; A.M. Moisejev; R.R. Shagiakhmetov; V.A. Dolgikh; P. Lightfoot

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 281 KB
• Volume: 147
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8412

✦ Synopsis

Twenty new multinary bismuth oxide halogenides have been prepared and characterized by means of X-ray powder di4raction. In their structures, 6uorite-related layers are separated by CsCl-related metal}halogen sheets. Four compounds are isostructural to Ca 3 Bi 5 CsO 8 Cl 6 which has an intergrowth structure between a SilleH n X1 phase and a novel structural element (99Y2::). Another four compounds crystallize in a novel structure type which is an intergrowth between the X2 SilleH n phase and the Y2 element. The remaining 12 compounds adopt the Y2 structure which is also a new structure type. In the former two families, Bi 3؉ can be substituted only by Pb 2؉ ; in the latter family, Bi 3؉ can also be substituted by Na ؉ and Ba 2؉ . The crystal structure of Pb 0.6 Bi 3.4 Cs 0.6 O 4 Cl 4 (intergrowth X2Y2 structure) has been solved from single crystal data, and the structure of Pb 0.6 Bi 1.4 Cs 0.6 O 2 Cl 2 (Y2 structure) has been solved from powder data. Crystal chemical relationships to SilleH n phases are discussed.