Structural magnetic and dielectric properties of NiFe2O4 BaTiO3 magnetoelectric multiferroic composites

Abstract

Abstract newlineThe thesis entitled Structural, magnetic and dielectric properties of NiFe2O4and#1048576;BaTiO3 newlinemagnetoelectric multiferroic compositesquot presents the experimental research work newlinedone during the last five years. It consists of seven chapters viz., Introduction, Experimental newlinemethods, Preparation and characterization, Structural properties, Magnetic newlineproperties, Dielectric properties of NiFe2O4and#1048576;BaTiO3 particulate composites newlineand finally the Summary and future scope of the present research work. The main newlinecontents and the discussion pertaining to them are systematically presented in the newlinefollowing paragraphs as chapters wise. newlineThe first chapter gives an overview of multiferroics focusing on magnetoelectric newline(ME) phenomena, particularly in ferrite and ferroelectric (FE) materials. The chapter newlinebegins with the importance of ME coupling in composites for a fundamental understanding newlineof basic physics. The essential basic information like crystal structure and newlinephase transitions of the single phase materials were presented. This chapter also newlinegives a thorough literature review and the existing gap between the past research newlineand present work. The motivation and main theme of the work were discussed newlinealong with the specific objectives of the thesis. newlineThe second chapter starts with importance of the solid state reaction (SSR) method. newlineThe appropriate experimental strategies adopted to fulfill the objectives of the research newlinework were mentioned in the thesis. The phase purity and structural characterization newlinewere carried out by x-ray diffraction (XRD) along with rietveld refinement. newlineThe microstructural and morphological analysis was done by the field emission newlinescanning electron microscopy (FESEM) in the back scattered electron (BSE) newlinemode. The Archimedes principle was used to determine the density of the samples, newlineand it was explained clearly. The temperature-dependent structural properties newlineof the ferriteand#1048576;ferroelectric composites were measured by the XRD and Raman spectroscopy. newlineThe magnetic properties of the composites were measured by the