Microwave-absorbing properties of Ni0.50-xZn0.50-xMe2xFe2O4 (Me = Cu, Mn, Mg) ferrite-wax composite in X-band frequencies

Ni0.5-xZn0.5-xMe2xFe2O4 (Me = Cu, Mg, Mn; x = 0.00 and 0.10) ferrite powders were prepared by the nitrate-citrate precursor method and investigated as a radar absorbing material ( RAM) in a frequency range of 8-12GHz (X-band). The effects of Cu2+, Mn2+ and Mg2+ substitution on the microwave-absorbing feature, the complex permeability (mu(r)*) and the complex permittivity (epsilon(r)*) were investigated. The microwave-absorbing properties were studied as a function of frequency, Me2+ content, and thickness of absorber. The adoption of Cu2+ and Mn2+ substitution was found to improve the microwave absorption and bandwidth, while the substitution of Mg2+ was found to reduce the microwave absorption in relation to non-substituted NiZn ferrite. (C) 2007 Elsevier B. V. All rights reserved.