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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Processing and characterization of a Ni-Co ferrite for sensor applications

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Author(s):
V. L. O. Brito ; S. A. Cunha ; F. F. Araújo ; J. P. B. Machado ; M. R. Silva ; C. B. Nunes
Total Authors: 6
Document type: Journal article
Source: Cerâmica; v. 61, n. 359, p. 341-349, Set. 2015.
Abstract

AbstractNi-Co ferrites are magnetostrictive ceramics that have potential application in magnetostrictive/ magnetoelastic sensors, as well as in magnetoelectric composites. Ni-rich Ni-Co spinel ferrite samples were processed by the ceramic method and bulk samples were sintered at 1350 ºC in the solid state and at 950 ºC with Bi2O3 liquid phase. The sintered samples were characterized by light microscopy, scanning electron microscopy, Raman spectroscopy, vibrating sample magnetometry and capacitance dilatometry. With Bi2O3 additions as small as 0.6 mol% it was possible to sinter the Ni-Co ferrite at 950 ºC, obtaining high-density samples; however, such liquid-phase sintered samples presented iron oxide particles. The studied samples presented magnetoelastic sensitivities very close to CoFe2O4, with significantly lower magnetic hysteresis. The results thus indicate that the magnetic properties of the samples analyzed are suitable for applications in magnetomechanical sensors. (AU)

FAPESP's process: 12/01448-2 - Cobalt ferrite development to sensors enclosering application to RF and microwave
Grantee:Antonio Carlos da Cunha Migliano
Support type: Regular Research Grants
FAPESP's process: 11/21258-0 - Construction of a force sensor using Fe-Ga and Fe-Al doped with boron
Grantee:Cristina Bormio Nunes
Support type: Regular Research Grants
FAPESP's process: 09/09524-7 - Characterization of the magnetostriction of cobalt ferrites
Grantee:Vera Lúcia Othéro de Brito
Support type: Regular Research Grants