Studies on Magnetic, Electric and Dielectric Properties of Ferrite Modified LCMO Nanocomposite Systems

Abstract

The evolution of new composite materials for multi-purpose applications turns into a trend in today’s research.The present study comprises the study of unique manganite La0.7Ca0.3MnO3and its ferrite modified nanocomposites synthesized via. sol-gel self-sustaining combustion method. The structural, optical, magnetic, electric, and dielectric properties of these synthesized products have been evaluated in the present study. These properties are found to be enhanced on enhanced incorporation of ferrites in the La0.7Ca0.3MnO3system. These enhanced properties of manganite-ferrite nanocomposites have been illustrated on the basis of cation distribution among various sites and internal structure modification. The important findings show CoFe2O4incorporated system has the more reasonable magnetic property as compared to NiFe2O4incorporated system. Whereas, NiFe2O4incorporated system shows the more reasonable dielectric property. These enhanced properties are valuable for the possible use of the nanocomposites in magnetic storage devices and nanocapacitor applications. The detailed study has been specified orderly in six different chapters.
Chapter I describes an introduction to rare-earth manganites, specifically lanthanum calcium manganite and its physical properties, spinel ferrites, specifically semi-hard cobalt ferrite and soft nickel ferrite, their physical properties and application scope of manganite-ferrite nanocomposites.
Chapter II describes the synthesis procedure and characterization of manganite nanoparticles and its ferrite incorporated nanocomposites synthesized by sol-gel auto combustion method.
Chapter III describes the structural, optical, magnetic, electric, and dielectric properties of La0.7Ca0.3MnO3 nanograins.
Chapter IV describes the structural, optical, magnetic, electric, and dielectric properties of (1-x) La0.7Ca0.3MnO3/x CoFe2O4 (x = 0, 0.1, 0.2, 0.3) nanocomposites.
Chapter V describes the structural, optical, magnetic, electric, and dielectric properties of (1-x) La0.7Ca0.3MnO3/x NiFe2O4 (x = 0, 0.1, 0.2, 0.3) nanocomposites.
Chapter VI focuses on important findings and comparative study of the thesis work and its future scope.