β-K3Fe(MoO4)2Mo2O 7

Abstract

The title compound, tripotassium iron(III) bis(orthomolybdate) dimolybdate, was obtained by a solid-state reaction. The main structural building units are one FeO6octahedron, two MoO4tetrahedra and one Mo 2O7dimolybdate group, all with point group symmetries m. These units are linked via cornersharing to form ribbons parallel to [010]. The three K+cations are located between the ribbons on mirror planes and have coordination numbers of 10 and 12. Two O atoms of one of the MoO 4tetrahedra of the dimolybdate group are disordered over two positions in a 0.524 (11):0.476 (11) ratio. The structure of the title compound is compared briefly with that of Rb3FeMo4O15.