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The complex metal oxides Ni2InSbO6 (NISO) and Ni2ScSbO6 (NSSO) have beenprepared in form of polycrystalline powders by a solid state reaction route.The crystal structure and magnetic properties of the compounds wereinvestigated using a combination of X-ray and neutron powder diffraction,electron microscopy, calorimetric and magnetic measurements. The compoundsadopt a trigonal structure, space group R3, of the corundum related Ni3TeO6(NTO) type. Only one of the octahedral Ni positions (Ni(2)) of the NTOstructure was found to be occupied by In (Sc). NTO has non-centrosymmetricstructure and is ferroelectric below 1000 K, dielectric and second harmonicmeasurements suggest that also NISO and NSSO are correspondingly ferroelectric.Magnetization measurements signified antiferromagnetic ordering below TN=60 K(NSSO) and 76 K (NISO). The magnetic structure is formed by twoantiferromagnetically coupled incommensurate helices with the spiral axis alongthe b-axis and propagation vector k = [0, ky,0] with ky= 0.036(1) (NSSO) andky= 0.029(1) (NISO). The observed structural and magnetic properties of NISOand NSSO are discussed and compared with those of NTO.

Spin and Dipole Ordering in Ni_2InSbO_6 and Ni_2ScSbO_6 with corundum-related structure