Journal
SENSORS
Volume 12, Issue 8, Pages 10086-10096Publisher
MDPI
DOI: 10.3390/s120810086
Keywords
magnetic ceramics; ferrites; magnetostriction; magnetoelastic sensitivity; magnetomechanical sensors; ceramics processing; liquid-phase sintering
Funding
- FAPESP [2009/09524-7, 2009/54001-2]
- CNPq
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [09/54001-2] Funding Source: FAPESP
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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.
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