Fabrication and Dielectric Properties of Fe-CNT/Al_2O_3 Bulk Composite Materials

摘要

In this paper, carbon nanotubes (CNT)/Fe powders were synthesized by a simple catalytic pyrolysis routine and the Fe-CNT/Al_2O_3 bulk composites were fabricated by hot-pressing sintering. The CNT/Fe powders were characterized by X-ray diffraction (XRD) and TGA-DSC. The dielectric properties of the Fe-CNT/Al_2O_3 bulk composites were measured by using Agilent E4991A impedance analyzer from 100MHz to lGHz. Both real part and imaginary part of the permittivity increased as added CNT into the composites. The imaginary part of permittivity (ε") ranged from 137 to 1300 with the frequency, which indicated a good dielectric loss properties.