ELECTRICAL-PHYSICAL AND DIELECTRIC PROPERTIES OF Pb_0,85Zr_0,53Ti_0,47O₃ - Sr₂FeMoO_6-δ COMPOSITES

Ferromagnetic-ferroelectric composite materials on the base of Pb_0.85Zr_0.53Ti_0.47O₃-Sr₂FeMoO_6-δ (PZT-SFMO) compound have been prepared by a complex ceramic technology and the citrate-gel synthesis. It was determined that the dielectric permittivity of a sample with a content of PZT of 55 wt. % and SFMO of 45 wt. % increases with temperature due to the rise of electrical conductivity and an influence of the dielectric dispersion caused by the Maxwell-Wagner relaxation. The electrical conductivity of the sample with a content of PZT of 35 wt. % and a content of SFMO of 65 wt. % possesses a clearly expressed frequency dependence, at temperature lower than 600 K, whereas at higher temperatures the electrical conductivity almost does not depends on frequency in the range 20 Hz-1 MHz. This is concerned with a considerable decrease of critical frequency at higher temperatures. At frequencies higher than 100 kHz and temperature lower than 600 K, the electrical conductivity increases by a power law.

strontium ferromolybdate, lead-barium titanate-zirconate, composite material, electrical conductivity, dielectric permittivity

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