Effect of Ion Ratio on Wave Absorption Properties of Magnesia-Cobalt Ferrite
Spinel MgxCo1-xFe2O4 was prepared by hydrothermal method.The effects of the proportion of Mg and Co doping on the crystal structure,microstructure and wave absorption properties of magnesia-cobalt ferrite were studied by X-ray diffraction(XRD),transmission electron microscopy(TEM)and vector network analyzer(VNA).The electromagnetic wave absorption mechanism of magnesia-cobalt ferrite was summarized.The results show that when pH=10,crystallization temperature is 180 ℃ and crystallization time is 8 h,magnesia-cobalt ferrite with irregular quadrilateral morphology is prepared.When the ratio of Mg2+and Co2+is 5∶5 and the thickness of the absorbing layer is 3.5 mm,the reflection loss value at the frequency of 9.50 GHz reaches-40.78 dB,and the effective absorption frequency bandwidth is 3.65 GHz(8.06-11.71 GHz),covering the X-band.The excellent absorbing properties are attributed to the combined action of natural resonance,exchange resonance and eddy current loss.
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