Magnetic and neutron diffraction study on quaternary oxides MTeMoO ₆ (M = Mn and Zn)

Crystal structures and magnetic properties of quaternary oxides MTeMoO ₆ (M = Mn and Zn) were investigated. From the Rietveld analyses for the powder x-ray and neutron diffraction measurements, their detailed structures have been determined. Both compounds have orthorhombic structure with space group P 2₁2₁2 and a charge configuration of M ²⁺Te⁴⁺Mo⁶⁺O₆. ZnTeMoO₆ shows diamagnetic behavior. In this structure, M ions are arranged in a square-planar manner. The temperature dependence of the magnetic susceptibility for MnTeMoO₆ shows a broad peak at ∼33K, which is due to a two-dimensional characteristic of the magnetic interaction. In addition, this compound shows an antiferromagnetic transition at 20K. The magnetic structure was determined by the powder neutron diffraction measurement at 3.3K. The magnetic moments of Mn²⁺ ions (4.45μ_B) order in a collinear antiferromagnetic arrangement along the b axis.