The magnetodielectric (MD) effect in two-layer composites consisting of polarized PbZr 0.53 Ti 0.47 O 3 (PZT) ceramics and Mn 0.4 Zn 0.6 Fe 2 O 4 (MZF) ferrite plates has been studied. The MD coefficient ε/ε(0) was established to depend on a thickness of the magnetostriction layer, a bias magnetic field strength, and an electric field frequency. Using thermodynamic approach an inspection of obtained results for two-layer structure has been carried out.

A shift of ferroelectric (T C ) and magnetic (T N ) phase transitions in the (x)PbZr 0.53 Ti 0.47 O 3 -(1 À x)Mn 0.4 Zn 0.6 Fe 2 O 4 (PZT-MZF) particulate ceramic composite depending on a volume ratio of the MZF ferrite and the PZT ferroelectric, respectively, has been studied. It is established that one reason for the T C and T N shifts is a mutual doping of the ferroelectric and magnetic phases as a result of high-temperature solid-state sintering of the PZT-MZF powders.

The possibility of the formation of high entropy single-phase perovskites using solid-state sintering was investigated. The BaO–SrO–CaO–MgO–PbO–TiO2, BaO–SrO–CaO–MgO–PbO–Fe2O3 and Na2O–K2O–CaO–La2O3–Ce2O3–TiO2 oxide systems were investigated. The optimal synthesis temperature is found between 1150 and 1400 °C, at which the microcrystalline single phase with perovskite structure was produced. The morphology, chemical composition, crystal parameters and dielectric properties were studied and compared with that of pure BaTiO3. According to the EDX data, the single-phase product has a formula of Na0.30K0.07Ca0.24La0.18Ce0.21TiO3 and a cubic structure.

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