Enhanced high temperature magnetic properties of ZnO − CoFe2O4 ceramic composite
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Data
2016
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Resumo
Multifunctional materials have been demonstrated to be suitable to several technological applications,
particularly those that comprise both electrical and magnetic properties. Most of the technological applications requires operating temperatures above room temperature. In this study, we investigated the
high temperature magnetic properties of 0.80ZnO 0.20CoFe2O4 ceramic composite, prepared by solid
state reaction method from nanoparticulate powders of zinc oxide and cobalt ferrites. The T-dependence
of the magnetic properties such as saturation magnetization, Ms, remanent magnetization, Mr, coercivity,
Hc, and Curie temperature, Tc, were investigated in a broad range of temperatures varying from room
temperature up to 870 K. We found that the Ms value of CoFe2O4 phase in the ceramic composite was ~1.5
times higher than those for pure CoFe2O4. Also the cubic magnetocrystalline anisotropy constant, K1,
determined by the Law of Approach to saturation at several temperatures above room temperature was
~1.8 times higher than those for pure CoFe2O4. These enhanced magnetic properties were discussed in
terms of the particle interactions induced by the thermal fluctuations, cation distribution, and exchange
of ions between zinc oxide and cobalt ferrites phase in the composite.
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Zinc oxide, Ho-doped ZnO, Combustion reaction, Band-gap energy, Dielectric constant
Citação
FRANCO JR., A.; PESSONI, H. V. S.; NETO, F. O. Enhanced high temperature magnetic properties of ZnO − CoFe2O4 ceramic composite. Journal of Alloys and Compounds, Amsterdam, v. 680, p. 198-205, 2016. DOI: 10.1016/j.jallcom.2016.04.110. Disponível em: https://www.sciencedirect.com/science/article/pii/S092583881631074X. Acesso em: 4 set. 2023.