Fabrication and characterization of lead free complex perovskites

Abstract

newline There are very few multiferroic materials which exhibit both ferroelectric and ferromagnetic properties simultaneously in a single phase. Multiferroic materials are very useful for many devices like memory devices, spintronics applications, newlineetc.To enhance the multiferroic properties and to reduce the leakage current of bismuth ferrite, we propose to fabricate and study the double perovskite (BiAFeCeO6, where A= Ca,Sr,Ba,Mg) by combining the elements of two perovskite, BiFeO3 and ACeO3 in equal ratio. Further, complex perovskite-based oxides exhibit a wide range of unusual characteristics and used as typical dielectric materials, magnetic materials, laser host materials, superconductors, etc. In view of this, we have synthesized CaCu3Ti4O12 (CCTO), SrCu3Ti4O12 (SCTO) and BaCu3Ti4O12 (BCTO) material by both chemical method and solid-state reaction method and studied their structural, dielectric, electrical and magneto electric properties. XRD analyses suggest that the compounds crystallize in single phase. The crystal structure for each compound is identified. The micrograph of the sintered samples was recorded at room temperature by using scanning electron microscope, which shows homogeneous distribution of grains. EDX confirm the formation of the desired compound. Detailed studies of dielectric properties (and#949;r, tanand#948;) and impedance parameters of the material provide an insight into the electrical properties and understanding of types of relaxation process occurred in the material. Attempts have been made to study the effect of microstructures specially the grain and grain boundary and electrode contributions in