Electrical properties of Ni0.93Co0.02Mn0.05Fe2O4 + BaTiO3 ME composites

Polycrystalline samples of mixed composites of Ni0.93Co0.02Mn0.05Fe2O4 + BaTiO3 were prepared by conventional double sintering ceramic method. The phase analysis was carried out by using X-ray diffraction technique. Variation of dc resistivity and thermo emf was studied as a function of temperature. AC conductivity (rac) was investigated in the frequency range 100 Hz–1 MHz. The loss tangent (tan d) measurements conclude that the conduction mechanism in these samples is due to small polaron hopping. The magnetoelectric conversion factor, i.e. dc(ME)H was studied as a function of intensity of magnetic field and the maximum value 407 lV/cm/Oe was observed at a field of 0.8 kOe in a composite with 85% BaTiO3 and 15% Ni0.93Co0.02Mn0.05Fe2O4 phase.