Complex dielectric permittivity and magnetic permeability of Fe/Fe 3O4 composite particles in 2-18 GHz

R. B. Yang, W. F. Liang, Chung-Chieh Chang, C. K. Lin, S. T. Liu, K. M. Kuo

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)77-82
Number of pages6
Issue number1
Publication statusPublished - 2012
Event7th International Conference on Microwave Materials and Their Applications, MMA 2012 - Taipei, Taiwan
Duration: Jun 3 2012Jun 6 2012


  • Complex permeability
  • Complex permittivity
  • Reflection loss

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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