Dielectric permittivity (ε ′ ), magnetic permeability (µ ′ ) and dielectric and magnetic loss (tan δ ε and tan δ µ , respectively) of magneto-dielectric cobalt ferrite-titania (CFO-TO) ceramic composites are determined from 200 to 300 MHz. The four different combinations of phases - that can be produced in the sintered composite, according to the starting CFO/TO molar ratio - allow to tune the macroscopic permittivity and permeability. For the first time impedance, miniaturization and magneto-dielectric loss of the four classes of composites are calculated and discussed. The displayed miniaturization factors between 4.4 and 8.2 in the very-high frequency (VHF) range corroborate their potential application as magneto-dielectric substrate materials for antennas. Remarkably, the ceramic composites characterized by 2 vol.% and 3 vol.% of CFO and TO, respectively, dispersed in Fe 2 CoTi 3 O 10 (FCTO) matrix display a magneto-dielectric loss lower than 0.07 and a miniaturization factor of 4.8.

Magneto-dielectric characterization of TiO2-CoFe2O4 derived ceramic composites / Galizia, Pietro; Baldisserri, Carlo; Galassi, Carmen; Maizza, Giovanni; Anbinderis, Maksimas; Grigalaitis, Robertas; Banys, Juras. - In: PROCESSING AND APPLICATION OF CERAMICS. - ISSN 1820-6131. - STAMPA. - 12:4(2018), pp. 350-356. [10.2298/PAC1804350G]

Magneto-dielectric characterization of TiO2-CoFe2O4 derived ceramic composites

Galizia, Pietro;Maizza, Giovanni;
2018

Abstract

Dielectric permittivity (ε ′ ), magnetic permeability (µ ′ ) and dielectric and magnetic loss (tan δ ε and tan δ µ , respectively) of magneto-dielectric cobalt ferrite-titania (CFO-TO) ceramic composites are determined from 200 to 300 MHz. The four different combinations of phases - that can be produced in the sintered composite, according to the starting CFO/TO molar ratio - allow to tune the macroscopic permittivity and permeability. For the first time impedance, miniaturization and magneto-dielectric loss of the four classes of composites are calculated and discussed. The displayed miniaturization factors between 4.4 and 8.2 in the very-high frequency (VHF) range corroborate their potential application as magneto-dielectric substrate materials for antennas. Remarkably, the ceramic composites characterized by 2 vol.% and 3 vol.% of CFO and TO, respectively, dispersed in Fe 2 CoTi 3 O 10 (FCTO) matrix display a magneto-dielectric loss lower than 0.07 and a miniaturization factor of 4.8.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2746252
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