title: Magnetic properties of liquid-phase sintered CoFe₂O₄ for 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, CoFe(2)O(4) was obtained using a conventional ceramic method and Bi(2)O(3) was used as additive in order to obtain liquid-phase sintered samples. Bi(2)O(3) was 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.
authors.affiliation: Instituto de Estudos Avançados, Rodovia dos Tamoios, km 5,5, Putim, São José dos Campos, SP 12228-001, Brazil. vlobrito@ieav.cta.br
authors.forename: Vera Lúcia Othéro
authors.initials: VL
authors.lastname: de Brito
authors.forename: Stéphanie Alá
authors.initials: SA
authors.lastname: Cunha
authors.forename: Leonardo Violim
authors.initials: LV
authors.lastname: Lemos
authors.forename: Cristina Bormio
authors.initials: CB
authors.lastname: Nunes
mesh_terms: D002516:Ceramics / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry*; D004574:Electromagnetic Fields; D005290:Ferric Compounds / Q000737:chemistry*; D008280:Magnetics; D014159:Transducers
chemical_list: D005290:Ferric Compounds; C001215:ferrite; D003035:Cobalt
keywords: ceramics processing; ferrites; liquid-phase sintering; magnetic ceramics; magnetoelastic sensitivity; magnetomechanical sensors; magnetostriction