ИСТИНА

Iron containing oxides are the most important functional particles, which finds tremendous applications. A modern attractive application is their use in biomedical technologies as components in systems for imaging, drug delivery, magnetically mediated hyperthermia et al. Particles with spinel and garnet structures possessing the highest performance in techniques where magnetically excited heating provide functionality. Specific important magnetic properties of ferrites used for these purposes may be modulated by the shape, size so as by substituting metals, included in their composition as by creating defects influencing the magnetic structure by cationic distribution and exchange interaction. In this work we report the results of investigation of polycrystalline ferrite particles based on spinel MgFe2O4 and Y3Fe5O12 garnet structure synthesized by different chemical route with and without substitution with various dimensions. Complex study including Mössbauer and Raman spectroscopy accompanied by X-ray diffractometry, SEM and measurements of field and temperature magnetic properties FORC allowed to reveal peculiarities of the structural and magnetic state of the samples and its influence on the heat generation performance. The experimental measurements were complementary supported by modern theoretical study based on the density functional theory (DFT) calculations.