Structure cristalline de type alluaudite K0.4Na3.6Co(MoO4)3

Acta Crystallographica Section E: Crystallographic Communications

Zid, M.F.²  Nasri, R.³  Fakhar Bourguiba, N.⁴ 

[1] de Tunis El Manar, 2092 El Manar Tunis, Tunisie;des Sciences de Tunis, UniversitéLaboratoire de Matériaux et Cristallochimie, Faculté

关键词: CRYSTAL STRUCTURE;    TRIPLE MOLYBDATE;    ALLUAUDITE-TYPE;   

DOI  :  10.1107/S2056989014025894

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

A new triple molybdate, potassium sodium cobalt tris­(molybdate), K0.4Na3.6Co(MoO4)3, was synthesized using solid-state reactions. The Co2+ and one Na+ cation are located at the same general site, each with occupancy 0.5. Another site (site symmetry 2) is occupied by Na+ and K+ cations, with occupancies of 0.597 (7) and 0.402 (6), respectively. The other two Na+ cations and one of the two Mo atoms lie on special positions (site symmetries -1, 2 and 2, respectively). The structure is characterized by M2O10 (M = Co/Na) dimers, which are linked by MoO4 tetra­hedra, forming infinite layers. The latter are connected firstly by insertion of one type of MoO4 tetra­hedra and secondly by sharing corners with the other type of MoO4 tetra­hedra. This results in an open three-dimensional framework with the cavities occupied by the Na+ and K+ cations. The structure is isotypic with Na3In2As3O12 and Na3In2P3O12. A comparison is made with structures such as K2Co2(MoO4)3 and β-NaFe2(MoO4)3 and their differences are discussed.

【 授权许可】

CC BY