Preparation and Electromagnetic Properties of CoFe2O4 and Its Composites with Expanded Graphite

doi:10.7503/cjcu20130358

Abstract

Abstract:

CoFe₂O₄(CF) and the composites of CoFe₂O₄/expanded graphite(CF/EG) were prepared by ultrasound-co-precipitation method. The structures, morphologies, thermal stabilities, electrical and magnetic properties of the samples were characterized by modern measurement technology. The results indicated that the magnetic property of CF was influenced by precipitator type, sintering temperature, etc. CF/EG composites had excellent electrical conductivity and absorbing properties. The sample with 2.0 mm coating thickness, made by CF/EG composite with m(EG)/m(CF) of 0.8 and paraffin, showed a minimum reflection loss of-16.08 dB at 13.53 GHz and an available bandwidth of 6.6 GHz in the range of 10—18.0 GHz. The absorbing properties of the composites originated mainly from the conductance loss and dielectric loss of EG, the magnetic loss of CF, the interface relaxation effect and synergistic effect between the two components.

Key words: Co-ferrite, Expanded graphite, Ultrasound-co-precipitation method, Electromagnetic property, Absorbing property

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XU Feng, XIANG Chen, LI Liang-Chao, MAO Meng-Yi, ZHOU Yan, DING Yan, LI Juan-Bi. Preparation and Electromagnetic Properties of CoFe₂O₄ and Its Composites with Expanded Graphite[J]. Chem. J. Chinese Universities, 2013, 34(10): 2254.

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Preparation and Electromagnetic Properties of CoFe₂O₄ and Its Composites with Expanded Graphite

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