Magnetic Properties of Liquid-Phase Sintered CoFe2O4 for Application in Magnetoelastic and Magnetoelectric Transducers

Author(s)

Othero de Brito, Vera Lucia ^[1] ; Cunha, Stephanie Ala ^[1] ; Lemos, Leonardo Violim ^[1] ; Nunes, Cristina Bormio ^[2]

Affiliation

^[1] Inst Estudos Avancados, BR-12228001 Sao Jose Dos Campos, SP - Brazil

^[2] Univ Sao Paulo, Escola Engn Lorena, BR-12600970 Lorena, SP - Brazil

• Document type: Journal article
• Source: SENSORS; v. 12, n. 8, p. 10086-10096, AUG 2012.
• Web of Science Citations: 7

Abstract

Cobalt ferrite is a ferrimagnetic magnetostrictive ceramic that has potential application in magnetoelastic and magnetoelectric transducers. In this work, CoFe2O4 was obtained using a conventional ceramic method and Bi2O3 was used as additive in order to obtain liquid-phase sintered samples. Bi2O3 was added to the ferrite in amounts ranging from 0.25 mol% to 0.45 mol% and samples were sintered at 900 degrees C and 950 degrees 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. (AU)

• FAPESP's process: 09/09524-7 - Characterization of the magnetostriction of cobalt ferrites
• Grantee: Vera Lúcia Othéro de Brito
• Support type: Regular Research Grants
• FAPESP's process: 09/54001-2 - Acquisition of cryogen-free equipment for the characterization of magnetic properties by vibrating sample magnetometry
• Grantee: Carlos Alberto Moreira dos Santos
• Support type: Multi-user Equipment Program