Author : Erum Pervaiz and I.H.Gul

Antimony (Sb3+) doped nickel ferrites (NiSbxFe2-xO4) with x=0.0, 0.035, 0.065 and 0.1, have been synthesized by hydrothermal route using an autoclave at 160 0C for 12 hrs. AC conductivities for all the samples have been observed in the frequency range of 1MHz to 3 GHz, where AC conductivity increases due to the addition of antimony in nanocrystalline nickel ferrites. Electromagnetic properties were studied by measuring complex dielectric permittivity (ɛ*), complex magnetic permeability (μ*) in the frequency range of 1 MHz to 3 GHz at room temperature using RF/impedance analyzer. Reflection losses (RL) were calculated for all the samples using permittivity and permeability measurements according to the transmission line theory. Maximum RL of -54dB was obtained for antimony doped nickel ferrite x=0.065 at 2.4 GHz with a band width of 1.2 GHz and decreases for high antimony concentration x=0.1 (-49dB). Low dielectric permittivity, high permeability and conductivity made this material a compatible option for single layered and multilayered chip inductors. While low RL values suggest nickel ferrite a possible candidate for electromagnetic absorption devices and radar absorbing material.

Keywords: Antimony nano ferrite, Complex dielectric permittivity, Complex permeability, Reflection losses.

Article published in International Journal of Current  Engineering  and Technology, Vol.3,No.5(Dec- 2013)