The magnetization processes of the BiFeO3 - Bi2Fe4O9 nanocomposite obtained by glycine nitrate combustion were studied. It was shown that the magnetic characteristics of the pure BiFeO3 and Bi2Fe4O9 compounds and the composite are significantly different. New properties of the synthesized substance are associated with the presence of exchange interaction at the interfaces.

Inorganic-polymer composites are widely used as radio-absorbing materials, the study of their properties is important from the point of view of improving technical characteristics. The results of the study of Nafion/thermoexpanded graphite and Nafion/carbon black composites by nuclear magnetic resonance and thermogravimetry are presented. The formation of new compounds at the contact boundaries of the components, leading to thermal stabilization of the composites, is shown. Differences between thermally expanded graphite and carbon black upon interaction with Nafion are discussed.

Magnetic properties of the nanostructure obtained by the introduction of magnetite particles into the channels of porous silicon from a colloidal solution of Fe3O4 in kerosene are studied. The temperature dependences of the parameters of these samples are investigated, and their features are established. It is assumed that the magnetic material consists of two fractions, one of which exhibits superparamagnetic behavior, and the second is in a blocked state up to room temperature.