Structural and magnetic properties of metal telluromolybdates MxM′1−xTeMoO6 (M, M′ = Mn, Co, Cd)

Synthesis, crystal structures and magnetic properties of metal telluromolybdates MxM′1−xTeMoO6 (M, M′ = Mn, Co, Cd) have been investigated. Their crystal structures have two-dimensional arrays of M and M′ atoms. From the powder X-ray diffraction measurements, MnxCo1−xTeMoO6 adopt an orthorhombic structure throughout the composition range (x = 0.0–1.0). On the other hand, MnxCd1−xTeMoO6 and CoxCd1−xTeMoO6 adopt two types of structures corresponding to their end members (orthorhombic for Mn- or Co-rich solid solutions; tetragonal for Cd-rich ones). In the intermediate compositions, it was found that two phases coexist with different metal components. Magnetic properties of these solid solutions were investigated. All the MnxCo1−xTeMoO6 exhibits an antiferromagnetic transition at ∼23 K. The antiferromagnetic transition was also observed in MnxCd1−xTeMoO6 and CoxCd1−xTeMoO6. However, the Néel temperature rapidly decreases with increasing the concentration of Cd and disappeared below x = 0.6, which is characteristic for two-dimensional magnetic system.

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