Dielectric and Electrical Characterization of Nd Modified BST Ceramic

Abstract

Ba4SrNdTi3V7O30 is a tungsten bronze structured polycr y stalline ceramic sample synthesized following solid-state reaction route at high temperature (i.e., at 950 °C). The room temperature X- ray diffraction study reveals the formation of single-phase orthorhombic structure. Detailed investigation of dielectric properties of Ba4SrNdTi3V7O30 in a broad frequency range (102-106Hz) at various temperatures (330-5000C) strongly suggests that these properties of the material are both frequency and temperature dependent. The existence of a dielectric anomaly proposes the compound has a transition at ~ 424^oC temperature for all the frequencies .From the study of temperature dependence ac conductivity the values of activation energy obtained in different regions, suggest the mixed type conduction process (i.e., ionic–polaronic and space charge generated from the oxygen ion vacancies) in the material. The ac conductivity spectrum obeys Jonscher’s universal power law.