title: KMo5O13 and KNb(1.76)Sb(3.24)O13.
abstract: The title compounds, potassium pentamolybdenum oxide, KMo(5)O(13), and potassium niobate antimonate or potassium niobium antimony oxide (1/1.76/3.24), KNb(1.76)Sb(3.24)O(13), were synthesized by solid-state reactions and are isomorphous in space group Cmcm. The structure of the Mo complex has three unique Mo atoms and consists of MoO(6) octahedra sharing edges to form Mo(2)O(6) pairs and Mo(3)O(9) triplets, which, in turn, form layers by sharing corners. These layers are linked together in the [100] direction, yielding a three-dimensional network similar to that of KSb(5)O(13). This framework delimits interconnected tunnels, running approximately along the [110] and [-110] directions, in which K(+) ions are located. In the isomorphous KNb(1.76)Sb(3.24)O(13) structure, one of the Mo sites in KMo(5)O(13) is replaced by Sb and the other two Mo sites have been replaced by Nb/Sb.
authors.affiliation: Département de Chimie, Faculté des Sciences de Monastir, 5000 Monastir, Tunisia. mohamedmongi@yahoo.fr
authors.forename: Mohamed Mongi
authors.initials: MM
authors.lastname: Ftini
authors.forename: Mohamed
authors.initials: M
authors.lastname: Krifa
authors.forename: Haddad
authors.initials: H
authors.lastname: Amor