Impedance spectroscopic studies of zirconium substituted 0.8BaTiO3-0.2Bi0.5K0.5TiO3 lead free ceramics

Zirconium substituted 0.8BaTiO(3)-0.2Bi(0.5)K(0.5)TiO(3) lead free ceramic materials were prepared by solid state reaction followed by high energy ball milling process. To understand its frequency dependent electrical properties, impedance spectroscopic studies were carried out. From the impedance studies it is observed that relaxation taken place from 375 degrees C. Single depressed semicircle was observed from the Cole-Cole plots. This indicates non-Debye kind of relaxation process. Grain resistance value was calculated from the Cole-Cole plots and it is found to be increasing with increase of Zr substitution. Modulus spectroscopic studies also confirm the non-Debye kind of relaxation process in the material. Variations in normalized values of Z ''/Z ''(max) & M ''/M ''(max) as a function of logarithm of frequency indicates short range conductivity in the present material.