Investigations on multifunctional Properties of some transition and Rare earth metal ions doped batio3

Abstract

In the past few decades, the multifunctional materials of perovskite (ABO3) structures have attracted much attention by various researchers across the globe. These materials have peculiar properties which are important for many technological applications in the field of multilayer ceramic capacitor (MLCC), optoelectronics, spintronics, actuators, sensors, electro-optic gates and dynamic random access memories (DRAMs), etc. Recent research and market endeavor development have shown that the multifunctional ceramic aterials exhibit, surging applications from passive to electrically active smart materials. However, integrating different functions in perovskite-type structure has been a challenge and a recent interest of study, especially of those functions that exclude each, particularly ferroelectric-ferromagnetic. Thus, in this research work, BaTiO3 perovskite has been chosen for the investigation, where BaTiO3 is a known ferroelectric compound for its chemical stability, crystal structure and capability to accommodate various dopants and effortlessness of being prepared as polycrystalline multifunctional materials. Hence, it has been decided to enhance its optical, magnetic and electrical ordering with suitable dopants. In particular, the transition metals ions (Mn, Li, Ni, Co) and rare-earth ion (La, Nd) ions have been selected as a dopant in A and B sites. Investigations have been carried out by substitution of respective dopants at different concentrations. Chapter 1 and chapter 2 describe the current scenario and state-of-the-art information carried out across the globe. In addition, chapter 2 also provides various preparation and characterization methods with basic principles and working aspects that are described in detail. newline