Yu.N. Afanas’ev, <span class="line">I.S. Rybachuk</span>, I.I. Kaneva, D.G. Krutogin, A.A. Mekhanikova

Yu.N. Afanas’ev, (Almaz-Antei OAO GSKB); I.S. Rybachuk, I.I. Kaneva, D.G. Krutogin, A.A. Mekhanikova, (National Research University MISiS)

The effect of stoichiometry deviation towards Fe₂O₃ excess or deficiency on the microstructure and properties of yttriumaluminum ferrogarnet has been studied. We show that for Fe₂O₃ excess, the Fe₃O₄ magnetite phase grows along with the ferrogarnet phase, while for Fe₂O₃ deficiency, the YFeO₃ orthoferrite phase develops. For Fe₂O₃ excess, the densening onset occurs later, at a higher temperature compared to that for the stoichiometric composition. This property allows one to separate the garnet formation and the proper sintering processes in the temperature and time ranges. To obtain high density ferrogarnet one should increase the sintering temperature by 100 ^oC compared to that for the stoichiometric composition. We found that the two-phase material containing (along with the matrix ferrogarnet phase) the YFeO₃ phase has higher magnetic properties compared to the single-phase stoichiometric composition and one order of magnitude lower dielectric losses due to the absence of ferrous cations and the properties of YfeO₃.

Ferrogarnet, dielectric losses, yttrium orthoferrite, magnetite.

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