Dielectric behaviour and magnetoelectric effect in copper-cobalt ferrite plus barium lead titanate composites

ME composites of Cu0.6Co0.4Fe2O4+Ba0.8Pb0.2TiO3 were prepared using a conventional ceramic double sintering process. The presence of phases was confirmed by X-ray diffraction (XRD). The variation of dielectric constant (epsilon') in the frequency range 100 Hz-1 MHz and also with temperature at constant frequency was studied. The conduction phenomenon is explained on the basis of small polaron hopping model. The confirmation of this phenomenon is made with the help of AC conductivity measurements. The static value of magnetoelectric conversion factor that is dc(ME)(H) was studied as a function of intensity of the magnetic field. The maximum value of ME coefficient was observed for 15% ferrite + 85% ferroelectric phase. (C) 2002 Elsevier Science B.V. All rights reserved.