Research Article: The aluminoarsenate K1.8Sr0.6Al3(AsO4)4

Date Published: May 01, 2012

Publisher: International Union of Crystallography

Author(s): Anissa Haj Abdallah, Amor Haddad.

http://doi.org/10.1107/S1600536812014304

Abstract

The title compound, potassium strontium trialuminium tetra­arsenate, was prepared by solid-state reaction. The structure consists of AlO6 octa­hedra (site symmetries 2.. and 2/m) and two AsO4 tetra­hedra (.2. and m..) sharing corners and edges to form a two-dimensional structure parallel to (010). The cations are occupationally disordered and are located in the interlayer space. For both types of cations, distorted coordination polyhedra are observed.

Partial Text

For further information on this structure type, see: K3Cr3(AsO4)4 (Friaa et al., 2003 ▶); K3Fe3(AsO4)4 (Ouerfelli et al., 2005 ▶). For similar structures, see: K3Fe3(PO4)4·H2O (Lii, 1995 ▶); Na3Fe3(PO4)4 (Lajmi et al., 2002 ▶). For background to the bond-valence method, see: Brown & Altermatt (1985 ▶).

 

Source:

http://doi.org/10.1107/S1600536812014304