β-Li0.37Na0.63Fe(MoO4)2.
The title compound, lithium/sodium iron(III) bis-[ortho-molyb-date(VI)], was obtained by a solid-state reaction. The main structure units are an FeO6 octa-hedron, a distorted MoO6 octa-hedron and an MoO4 tetra-hedron sharing corners. The crystal structure is composed of infinite double MoFeO11 chains along the b-axis direction linked by corner-sharing to MoO4 tetra-hedra so as to form Fe2Mo3O19 ribbons. The cohesion between ribbons via mixed Mo-O-Fe bridges leads to layers arranged parallel to the bc plane. Adjacent layers are linked by corners shared between MoO4 tetra-hedra of one layer and FeO6 octa-hedra of the other layer. The Na(+) and Li(+) ions partially occupy the same general position, with a site-occupancy ratio of 0.631 (9):0.369 (1). A comparison is made with AFe(MoO4)2 (A = Li, Na, K and Cs) structures.
Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis ElManar, 2092 Manar II Tunis, Tunisia.
Amira
A
Souilem
Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis ElManar, 2092 Manar II Tunis, Tunisia.
Mohamed Faouzi
MF
Zid
Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis ElManar, 2092 Manar II Tunis, Tunisia.
Ahmed
A
Driss