Abstract
A new hydrated oxoselenite(IV) Co4(H2O)3(SeO3)4 was prepared by hydrothermal synthesis. The structure was solved from single-crystal X-ray diffraction data. This new phase crystallizes in the monoclinic unit cell a = 8.9369 (4) Å, b = 8.4225(4) Å, c = 9.6197(4) Å, β = 116.8239(13)° with a non-centrosymmetric space group P21 and is isostructural to Mn4(H2O)3(SeO3)4. The 3D framework is constructed of [CoO6] octahedra forming infinite zig-zag layers and [SeO3] trigonal pyramids placed between the layers. The magnetic susceptibility measurements indicated a Curie-Weiss paramagnetic behaviour for T ≳ 50 K and an effective moment μeff = 3.9(1) μB per Co2+, which corresponds to the spin only value for high-spin Co2+ (S = 3/2). An antiferromagnetic (AF) transition is observed at TN = 9 K with metamagnetic behaviour and two field-induced states. In addition, a small remnant magnetization characteristic of a canted AF state is observed at a temperature below 7 K. Dielectric measurements performed on one single crystal showed that the dielectric properties of Co4(H2O)3(SeO3)4 change in the magnetically ordered state, suggesting magnetoelectric coupling. Specifically, in the canted AF ordered state (T < 7 K), we observed a positive magnetocapacitance effect of 4.5% under a 1 T field, confirming that Co4(H2O)3(SeO3)4 is magnetoelectric.
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