Structural and electromagnetic properties of yttrium-substituted Ni-Zn ferrites

The effect of Y3+ substitution on the structural and magnetic properties of Ni0.5Zn0.5YyFe2-yO4 (0.01 <= y <= 0.05) was investigated. Microwave absorption properties of these ferrites in the frequency range 1 MHz to 1.8 GHz were also studied. Yttrium substitution slightly reduces crystallite sizes and cell parameters, and modifies saturation magnetization, permeability and permittivity in the explored frequency range. The dielectric constant decreases with yttrium content, showing a constant behavior in the explored frequency range. The maximum of the magnetic losses diminishes and shifts to higher frequencies with yttrium inclusion. Yttrium-substituted Ni-Zn ferrites (with Y content <= 0.05 per formula unit) can be considered good attenuator materials in the explored microwave range. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.