The ceramic composites BaTiO3–Ni0.5Zn0.5Fe2O4(BT–NZF) were prepared by two methods [6]: (i) mixing the BT powders (solid-state) and NZF (co-precipitation),milling, isostatically pressing and sintering; (ii) co-precipitating FeIII–NiII–ZnII nitric salts in a NaOH solution, in which the BT powders were previously dispersed.The powders were dried and calcined at 400 1C for 1 h to form the NZF phase. The mixture was then milled, isostatically pressed and sintered.