Investigation on synthesis and characterization of piezoelectric ceramics for energy storage applications

Abstract

Ceramic material with perovskite structure (ABO3), has received great attention in the field of science and technology in the past few decades. This is due to the fact that large number of materials of this class and related structures show fascinating functional properties for industrial applications. Piezoelectric material is a unique class of perovskites. Due to its electronic versatility of these materials play an enormous role in technology. These materials have the ability of generating an electric potential in response to an applied mechanical stress or vice versa. These are extensively used in the development of sensors, actuators, transducers, energy storage capacitor and many more electronics devices because of their superior dielectric, piezoelectric and energy storage properties. The thesis has been classified into seven chapters: Chapter 1 describes the concise introduction of ceramic materials and its classification based on its symmetry principle. The piezoelectricity, ferroelectricity, dielectric, and the phase transitions concepts have been discussed. The dielectric polarization mechanisms were explained elaborately. The background of energy storage in capacitors and its storage density have been detailed. The scope of the thesis was also illustrated. Chapter 2 elaborates the sample preparation method and experimental techniques used to synthesis the ceramic materials. The characterization methods used to study the properties of ceramic material was also presented in this work. Chapter 3 presents theinvestigation on structural and electrical properties of 0.40Na0.5Bi0.5TiO3-(0.6-x)SrTiO3-xPbTiO3 ceramics for x=0.08, 0.18, and 0.28 compositions are presented. The ceramics are synthesizedusing solid-state reaction technique. Powder X-ray diffraction studies reveal that the ceramic is homogeneous and has a tetragonal structure with space group P4mm. It also reveals the co-existence of tetragonal and cubic phases with 0.08 mol% lead titanate. The surface morphology of the material shows a reduction i