title: Redetermination of the crystal structures of the 'Arppe compound' Bi24O31Cl10 and the isomorphous Bi24O31Br10
abstract: The crystal structures of Bi24O31X10 (X = Cl, Br; 24-bismuth 31-oxide decachloride/-bromide) have been redetermined. The structure models obtained resemble the model described in the literature about 60 years ago, but differ from it in some details of the O substructure and in the fact that the structure for X = Cl is a twofold superstructure of the literature model. A fictional mechanism is given by which the formerly described incorrect O substructure is transferred into the correct one.
authors.affiliation: Kristallographisches Institut der Albert-Ludwigs-Universitat Freiburg, Freiburg i.Br., Germany.
authors.initials: U
authors.lastname: Eggenweiler
authors.initials: E
authors.lastname: Keller
authors.initials: V
authors.lastname: Kramer