Abstract
In this paper, we report on the structural and magnetic properties, as deduced from susceptibility measurements and neutron powder diffraction experiments, of an orthorhombic nickel disulfate, Li${}_{2}$Ni(SO${}_{4}$)${}_{2}$. This phase presents NiO${}_{6}$ octahedra linked via SO${}_{4}$ groups only, leading to an antiferromagnetic behavior resulting from super-super-exchange interactions. Magnetic moments order below ${T}_{N}$ = 28 K and the observed magnetic structure can be explained using two antiferromagnetic and one ferromagnetic exchange interactions, which are discussed in relation with the Goodenough-Kanamori-Anderson rules. The magnetic structure, with k = (0, 0, 0), has the symmetry $P{b}^{\ensuremath{'}}{c}^{\ensuremath{'}}{a}^{\ensuremath{'}}$ that has the inversion center associated with time inversion, so the compound should be a linear magnetoelectric.
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