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Composites based on barium titanate and nickel zinc ferrite doped with cooper  and samarium were prepared by a mixing method. The formation of barium  titanate tetragonal crystal structure and nickel zinc ferrite cubic spinel  structure was identified. Polygonal grains were formed in all three types of  ceramics. Due to the very high conductivity of ferrite phase in the  materials the ferroelectric hysteresis loops were roundish and not typical  for classical ferroelectric material. The break down field was found to be  similar for all compositions. Leakage current measurements have shown the  existence of different types of conductivity mechanisms in each material.  The impedance analysis suggested a bit stronger impact of grain boundaries  on total conductivity of the composites and the mechanism of polaronic  conduction of two types. The magnetization of the composites is lower than  for the pure ferrite phase and corresponds to the weight fraction of the  ferrite phase. The soft magnetic nature of these composites might be very  useful for development of multifunctional devices which will be able to  switch the magnetization with small external magnetic field. Humidity  sensing properties of the prepared ceramics were also investigated.  [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. 451-03-68/2020- 14/200053 and 451-03-68/2020-14/200134]

Study of barium titanate/nickel-zinc ferrite based composites: Electrical and magnetic properties and humidity sensitivity