Abstract
Using atomic force microscopy and small-angle X-ray scattering, fractal-cluster formations ranging in size from 4 to 21 nm were detected in all compositions of nickel-zinc ferrospinels. The obtained fractal dimension for the observed aggregates indicates that the reaction-limited mechanism of cluster aggregation is realized in the studied system of ferrospinels, and the existence of larger crystal aggregates is explained within the framework of the neutral charge model due to a decrease in electrostatic forces between clusters. Considering that the layered quasi-two-dimensional aggregate has a fractal dimension closer to two, it is assumed that the formation of three-dimensional aggregates occurs as a result of magnetic interaction between primary nanoparticles.
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