Abstract
ABSTRACTThe spinel Ni0.7Zn0.3RE0.04Fe1.96O4 ferrites with RE˭Ce and Y are fabricated by the polyacrylamide gel method. The effect of rare earth ions substitution for iron ions on the structure, morphology, electromagnetic and microwave-absorbing properties of Ni-Zn ferrites are investigated by X-ray diffraction (XRD), transmission electron microscope (TEM), thermogravimetric and differential thermal analysis (TG-DTA) and HP8510B network analyzer, respectively. The results indicate that Ni0.7Zn0.3RE0.04Fe1.96O4 ferrites form a pure cubic spinel structure, and Ce3+ and Y3+ substitute into the crystal lattice. Both the real ϵ′ and imaginary ϵ″ parts values of complex permittivity for Ni0.7Zn0.3RE0.04Fe1.96O4 ferrites are higher than those for Ni-Zn ferrites in X-band (8.2-12.4 GHz) frequency range. When RE ions substitute for iron ions, the real μ′ and imaginary μ″ parts values of complex permeability for Ni0.7Zn0.3RE0.04Fe1.96O4 ferrites decrease and increase, respectively. The microwave-absorbing properties are better for RE-substituted Ni-Zn ferrites than Ni-Zn ferrites. For Ni0.7Zn0.3Ce0.04Fe1.96O4 ferrites, the minimum loss is −12.5 dB at 18 GHz for an absorber thickness of 2 mm.
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