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

Autor(es)

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

Afiliação do(s) autor(es)

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

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

• Tipo de documento: Artigo Científico
• Fonte: SENSORS; v. 12, n. 8, p. 10086-10096, AUG 2012.
• Citações Web of Science: 7

Resumo

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)

• Processo FAPESP: 09/54001-2 - EMU: aquisição de equipamento cryo-free para caracterização de propriedades magnéticas por magnetometria de amostra vibrante (VSM)
• Beneficiário: Carlos Alberto Moreira dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 09/09524-7 - Caracterização da magnetostricção de ferritas de cobalto
• Beneficiário: Vera Lúcia Othéro de Brito
• Modalidade de apoio: Auxílio à Pesquisa - Regular