Complex Dielectric Permittivity and Magnetic Permeability of Fe/Fe3O4 Composite Particles in 2-18 GHz
Journal
Ferroelectrics
Journal Volume
434
Pages
77-82
Date Issued
2012
Author(s)
Abstract
In the present study, iron/iron oxide (with a ratio of 4/1, 1/1, and 1/4) composite particles were prepared by precipitation. The morphology and phase composition were examined by scanning electron microscopy and X-ray diffraction techniques. The as-prepared composite particles were mixed with epoxy resin to prepare microwave absorbers and the corresponding electromagnetic properties were evaluated. The experimental results showed that the composite powder exhibited a mixture of α-Fe (∼4 μm) and Fe3O4 (∼30 nm) phases. The amount of iron oxide plays an important role in the electromagnetic properties of microwave absorbers. In general, complex permittivity (ε' and ε") and permeability (μ' and μ") increased with increasing amount of iron oxide additions. The minimum reflection loss can reach -16.7 dB at 9.0 GHz for 50 wt% of Fe/Fe3O4 = 1/4 composite absorber with 3 mm in thickness. Copyright © Taylor & Francis Group, LLC.
SDGs
Type
journal article