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Sensors 2012, 12(8), 10086-10096; doi:10.3390/s120810086

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

1
Instituto de Estudos Avançados, Rodovia dos Tamoios, km 5,5, Putim, São José dos Campos, SP 12228-001, Brazil
2
Escola de Engenharia de Lorena, Universidade de São Paulo, Polo Urbo-Industrial, Gleba AI-6, Lorena, SP 12600-970, Brazil
*
Author to whom correspondence should be addressed.
Received: 31 May 2012 / Revised: 9 July 2012 / Accepted: 10 July 2012 / Published: 25 July 2012
(This article belongs to the Section Physical Sensors)
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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 °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.
Keywords: magnetic ceramics; ferrites; magnetostriction; magnetoelastic sensitivity; magnetomechanical sensors; ceramics processing; liquid-phase sintering magnetic ceramics; ferrites; magnetostriction; magnetoelastic sensitivity; magnetomechanical sensors; ceramics processing; liquid-phase sintering
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

de Brito, V.L.O.; Cunha, S.A.; Lemos, L.V.; Nunes, C.B. Magnetic Properties of Liquid-Phase Sintered CoFe2O4 for Application in Magnetoelastic and Magnetoelectric Transducers. Sensors 2012, 12, 10086-10096.

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