Issue 20, 2012

Synthesis of hexagonal Fe microflakes with excellent microwave absorption performance

Abstract

Fe microflakes with uniform size and well-defined shape were successfully synthesized by hydrogen-thermal reduction of α-Fe2O3 precursor microflakes. The hexagonal Fe microflakes have edge lengths of about 5 μm and thicknesses of about 500–1000 nm. The complex permittivity and permeability of Fe microflakes–paraffin composite were measured using a vector network analyzer in the 2–18 GHz frequency range. Remarkable dielectric relaxation, natural resonance and exchange resonance were observed in the complex permittivity and permeability spectrum. Electromagnetic wave absorption (EMA) performance of samples was evaluated by using transmission line theory. An excellent microwave absorption performance was obtained for a coating containing Fe microflakes as filler, in which the maximum reflection loss is −15.3 dB and effective EMA band (RL < −10 dB) covers the whole frequency range of 12.2–16.6 GHz.

Graphical abstract: Synthesis of hexagonal Fe microflakes with excellent microwave absorption performance

Supplementary files

Article information

Article type
Paper
Submitted
27 May 2012
Accepted
03 Jul 2012
First published
03 Jul 2012

CrystEngComm, 2012,14, 6827-6832

Synthesis of hexagonal Fe microflakes with excellent microwave absorption performance

L. Fu, J. Jiang, C. Xu and L. Zhen, CrystEngComm, 2012, 14, 6827 DOI: 10.1039/C2CE25836F

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