Microwave absorption properties of double-layer composites using CoZniNiZniMnZn-ferrite and titanium dioxide

Zinc substituted ferrite powders Me0.5Zn0.5Fe2O4(Me=Co, Mn and Ni) were prepared by the sol-gel auto-combustion method. The present study highlights development of Single layer and double layer composite microwave absorbing materials using Ferrites, Titanium dioxide and Epoxy matrix. Moreover microwave absorption property, i.e reflection loss evaluated at X-band frequency. XRD analysis of the filler particles were carried out to evaluate crystal structure, average crystallite diameter. Morphology of the filler particles were studied with FESEM. Hysteresis behavior of the ferrites samples were studied with Vibrating Sample Magnetometer. The most important parameter governing the absorption properties of microwave absorbers i.e. permittivity and permeability studied in a vector network analyzer. Measured reflection loss value of single-layer NiZn-ferrite based microwave absorber reaches -11.2 dB at 12.05. GHz. Whereas, reflection loss value of double-layer CoZn-ferrite/TiO2 based microwave absorber reaches -24.3 dB at 12.02. GHz. The result shows that microwave absorption property and bandwidth of absorption of double-layer microwave absorber was found to improve comparison to single layer. (C) 2014 Elsevier B.V. All rights reserved.