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

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

Research output: Contribution to journalArticle

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)77-82
Number of pages6
JournalFerroelectrics
Volume434
Issue number1
DOIs
Publication statusPublished - 2012

Keywords

  • Complex permeability
  • Complex permittivity
  • Reflection loss

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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