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• Cunha, S
• Lemos, L
• Nunes, C
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• Cunha, S
• Lemos, L
• Nunes, C
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• Cunha, S
• Lemos, L
• Nunes, C

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

Article

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

Vera Lúcia Othéro de Brito ^1,* , Stéphanie Alá Cunha ¹ , Leonardo Violim Lemos ¹  and Cristina Bormio Nunes ²

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; in revised form: 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

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