Effect of molar ratio on the microstructure, dielectric and electromagnetic properties of BaTiO₃/CoFe₂O₄ ceramic

BaTiO₃/CoFe₂O₄ (BTO/CFO) composite ceramics were synthesized by conventional solid-phase method, and the effects of different BaTiO₃ (BTO) and CoFe₂O₄ (CFO) contents on the microstructure, magnetoelectric properties were systematically studied. X-rays showed that ferroelectric and ferromagnetic phases can coexist without chemical reaction. The dielectric constant decreased with the decrease of the molar ratio of BTO, and the dielectric constant increased with the increasing of temperature. The dielectric loss decreased first and then increased and finally decreased as a function of frequency, and the dielectric loss increased with the increase of temperature. The composite with the molar ratio of BTO/CFO (3:1) demonstrated better ferroelectric properties that remnant polarization is 0.82 μC cm⁻² and the coercive electric field is 10.23 kV cm⁻¹. The best magnetic property was shown in BTO/CFO (1:3). (paper)