Abstract
The evolution of the hard and soft modes in the crystal structure of MnxZnyFezO4 manganese-zinc spinel ferrites is investigated theoretically and experimentally (x-ray structure analysis and magnetic measurements). It is shown that tetragonal and rhombohedral distortions of the cubic structure and fluctuations of the soft mode are accompanied by the formation of clusters in the form of quasi-two-dimensional fragments (50–200 and 400–1200 A), which involve families of γ-Mn2O3, γ-Mn3O4, and α-Fe2O3 oxide planes inherently bound to the spinel matrix.
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