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Magnetic and dielectric properties in the UHF frequency band of half-dense Ni-Zn-Co ferrites ceramics with Fe-excess and Fe-deficiency

Jean-Luc Mattei 1 David Souriou 2 Alexis Chevalier 3, 4
1 Lab-STICC_UBO_MOM_MF
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance, UBO - Université de Brest
4 Lab-STICC_UBO_MOM_MF
IBNM - Institut Brestois du Numérique et des Mathématiques, Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
Abstract : This work investigates electromagnetic properties of half-dense ceramics with compositions Ni 0.5 Zn 0.3 Co 0.2 Fe y O 4-d where y = 1.98 (Iron deficient, noted ID) or y = 2.3 (Iron in excess, noted IE). IE and ID materials are obtained by chemical coprecipitation route. The obtained nano-sized powders are pressed and annealed at two temperatures (800 °C, 900 °C), so has to obtain half-massive ceramics. Ferrous and ferric ions coexist in the crystalline structures, but the former in a less extend for ID ferrite. The concomitant influences of Fe 2+ and Fe 3+ on the dielectric and magnetic losses (e 00 /e 0 and m 00 /m 0 , respectively) are considered at frequency up to 6 GHz. The permeability dispersion changes from relaxation-like to resonance-like with the decrease in ferrous ions. In reason of the relaxing-like behavior of Fe 2+ , and because of a relatively high amount in Fe 2+ , IE sample shows lower total losses (magnetic and dielectric) than ID sample. These conclusions applied for T A = 900 °C. At frequencies above 700 MHz, the total loss values (IE and ID samples) are prohibitive for antenna downsizing whatever is the firing temperature value (800 °C and 900 °C). Whereas at frequencies below 700 MHz Ni 0.5 Zn 0.3 Co 0.2 Fe 2.3 O 4+d may leads to better antenna performances than Ni 0.5 Zn 0.3 Co 0.2 Fe 1.98 O 4-d .
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https://hal.univ-brest.fr/hal-01690608
Contributor : Alexis Chevalier <>
Submitted on : Tuesday, January 23, 2018 - 11:22:32 AM
Last modification on : Wednesday, June 24, 2020 - 4:19:36 PM

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Jean-Luc Mattei, David Souriou, Alexis Chevalier. Magnetic and dielectric properties in the UHF frequency band of half-dense Ni-Zn-Co ferrites ceramics with Fe-excess and Fe-deficiency. Journal of Magnetism and Magnetic Materials, Elsevier, 2018, 447, pp.9 - 14. ⟨10.1016/j.jmmm.2017.09.030⟩. ⟨hal-01690608⟩

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