Abstract
Magnetic susceptibility of nickel-containing solid solutions with layered perovskite-like structure of bismuth niobate, Bi5Nb3O15, was studied. High-spin nickel atoms, Ni(III), were present at low concentrations of the solid solutions. The formation of exchange-bonded aggregates (dimers) of nickel(II) atoms with antiferromagnetic type of exchange was found in the solid solutions. The parameters of exchange interactions in the dimer clusters and the distribution of monomers and dimers of nickel atoms were calculated as a function of the solid solution concentration.
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