Abstract
Using the nuclear magnetic resonance, X-ray and electromagnetic methods we investigated structure and properties of the single- and polycrystalline manganous and manganese-zinc ferrites: MnFe2O4, Mn0.8Zn0.2Fe2O4, Mn0.6−xCuxZn0.3Fe2.1O4 (0 ≤x ≤ 0.3). The real structure of the manganous and manganese-zinc ferrites is found to contain simultaneously vacancies in cationic and anionic sublattices. The analysis of the NMR spectra of55Mn,57Fe,63,65Cu and67Zn ions allowed us to find the magnetic and valence states of all ions and their distribution in the real spinel structure. It was shown that the Fe3+ paramagnetic ions, Zn2+ diamagnetic ions and cationic vacancies in tetrapositions are distributed statistically. The Mn3+ and Cu2+ Jahn-Teller ions and presumably Fe2+ in octahedral positions are distributed nonstatistically forming cluster-type mesoscopic inhomogeneities. The correlation between distribution of ions and vacancies in the real structure of manganese-zinc ferrites and their functional electromagnetic properties was found.
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