Structure analysis of cobalt ferrite/titania-silica composite

Structure analysis of cobalt ferrite/titania-silica composite Pietro Galizia, Carlo Baldisserri, Claudio Capiani, Carmen Galassi CNR-ISTEC Via Granarolo, 64, I-48018 Faenza (ITALY) Contact author: pietro.galizia@istec.cnr.it (Pietro) Magnetodielectric bulk composite of a magnetic phase in dielectric matrix have been studied. Silica coated titania powder was produced by elctrocoagulation and used as dielectric matrix; while the cobalt ferrite powder was selected as magnetic filler. This study aims at tailoring the magnetic and dielectric phases and their interfaces in order to obtain new electromagnetic properties. The microstructure of sintered titaniasilica/ cobalt ferrite composites has been related to compositional modifications in terms of silica/titania weight ratio and titania-silica/cobalt ferrite volume ratio. The crystalline structure was studied by XRD analysis supported also by EDS investigation and image analysis performed on the electron micrographs. The image analysis supported the XRD and EDS interpretations, and contributed to evaluate the effective volume content of the phases after heat treatment.