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

Sensors

Vera Lྫྷia Othéro de Brito¹  Stéphanie Alá Cunha¹  Leonardo Violim Lemos¹ 

[1] Instituto de Estudos Avançados, Rodovia dos Tamoios, km 5,5, Putim, São José dos Campos, SP 12228-001, Brazil; E-Mails:

关键词: magnetic ceramics;    ferrites;    magnetostriction;    magnetoelastic sensitivity;    magnetomechanical sensors;    ceramics processing;    liquid-phase sintering;   

DOI  :  10.3390/s120810086

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.