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.


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.

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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 ▶).