ChemInform Abstract: STRUCTURAL STUDY OF THE DOUBLE MOLYBDATE POTASSIUM ZINC TRIMOLYBDATE (K4ZN(MOO4)3)

Abstract

Die Titelverbindung existiert in einer Hoch‐ und einer Tieftemperatur‐Modifikation (Raumgruppen P2, 2,2, , Z=4, bzw. P2, ; Übergangstemperatur 365°C).

Orthomolybdates in the Cs–FeII,III–Mo–O System: Cs4Fe(MoO4)3, Cs2Fe2(MoO4)3 and CsFe5(MoO4)7

“…For CsFe 5 K α radiation (λ = 0.71073 Å) at 298(2) and 100(2) K with a Bruker Kappa Apex II CCD diffractometer equipped with a 4 k CCD area detector ( Table 6). The φ-scan technique was employed to measure intensities.…”

“…Since no entries that concern compounds with analogous cell parameters or AB 5 C 7 X 28 composition were found in the Inorganic Crystal Structure Database (ICSD), [12] a new crystal-structure type, namely, the CsFe 5 (MoO 4 ) 7 type, was established. It consists of separate [5] (see Figure 5). Due to a smaller amount of MoO 4 groups per 3d cation in K 2 Zn 2 (MoO 4 ) 3 more MoO 4 tetrahedra are connected with ZnO 6 through two oxygen atoms, whereas in CsFe 5 -(MoO 4 ) 7 more MoO 4 tetrahedra have terminated oxygen atoms.…”

“…K 2 M 2 (MoO 4 ) 3 with 3d elements as M 2+ crystallize in the K 2 Zn 2 (MoO 4 ) 3 structure type [5] with M 4 O 18 tetramers of edge-sharing MO 6 octahedra and K atoms that occupy large spaces in the structure. The low density of these structures could lead to pressure-induced phase transitions with the formation of more dense polymorphs, which was investigated and confirmed for K 2 Co 2 (MoO 4 ) 3 .…”

Subsolidus phase relations in the systems K2O–ZnO–AO3 (A=Mo, W)

“…The compound K 4 Zn(MoO 4 ) 3 belongs to orthorhombic system with space group P2 1 2 1 2 1 . Its lattice parameters are a = 10.630Å, b = 21.970Å, c = 6.065Å [32]. Compound K 2 Zn 2 (MoO 4 ) 3 crystallizes in monoclinic system with space group P2 1 /c.…”