Effects of the chemical composition of the magnetostrictive phase on the dielectric and magnetoelectric properties of cobalt ferrite-barium titanate composites

Magnetostrictive-piezoelectric composites of CoFe(2)O(4)-BaTiO(3) and CoMn(0.2)Fe(1.8)O(4)-BaTiO(3) were obtained with standard solid-state ceramic processing. X-ray diffraction (XRD) analysis revealed the presence of the spinel and perovskite phase without the appearance of the residual phase. The influence of the phase content on the dielectric constant, loss tangent, magnetization, magnetostriction and magnetoelectric signal was studied, and the results were correlated with the microstructure and the amount of ferrite. The magnetoelectric response of the composite indicated that the substitution of iron ions for manganese ions decreased the dielectric loss and improved the magnetoelectric signal of the composite samples. (C) 2011 Elsevier B.V. All rights reserved.