Bushkova V. Electromagnetic properties of magnesium and nickel nanoferrites with diamagnetic substitution and their composites based on barium titanate.

The thesis studies the mechanisms of magnesium-zinc and nickel-aluminum ferrite powders nanoparticles formation obtained by the method of SGA. It was found that the process of the dry gel autocombustion occurred due to thermal generation of nitrate ions. The experimental study of the correlation between morphological, structural and magnetic properties of nanodispersed ferrites was done and prototypes of the system as the basis for cathode compositions of lithium power sources was tested by the first time. On the basis of electrical research of ferrite-piezoelectric composites based on barium titanate, it was found that at temperatures about 400 K the change of conductivity mechanism occurred due to the phase transition regardless of concentration. It was shown that the content of non-magnetic component in the composites caused the reduce of permeability and residual induction, as well leads to slight increase of coercivity.