Magnetic properties of liquid-phase sintered CoFe2O4for application in magnetoelastic and magnetoelectric transducers

Abstract

Cobalt ferrite is a ferrimagnetic magnetostrictive ceramic that has potential application in magnetoelastic and magnetoelectric transducers. In this work, CoFe2O4was obtained using a conventional ceramic method and Bi2O3was used as additive in order to obtain liquid-phase sintered samples. Bi2O3was added to the ferrite in amounts ranging from 0.25 mol% to 0.45 mol% and samples were sintered at 900 °C and 950 °C. It was observed the presence of Bi-containing particles in the microstructure of the sintered samples and the magnetostriction results indicated microstructural anisotropy. It was verified that it is possible to get dense cobalt ferrites, liquid-phase sintered, with relative densities higher than 90% and with magnetostriction values very close to samples sintered without additives. © 2012 by the authors; licensee MDPI, Basel, Switzerland.