Journal
PHYSICA B-CONDENSED MATTER
Volume 406, Issue 24, Pages 4620-4624Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2011.09.039
Keywords
Composite materials; Mechanical alloying; Microwave absorption
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Funding
- National Natural Science Foundation of China [11074101]
- National Science Fund for Distinguished Young Scholars [50925103]
- Fundamental Research Fund for the Central Universities [lzujbky-2011-54]
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The flower-like ZnO and ZnO/carbonyl-iron composite have been prepared by a sonochemical route and ball-milling process, respectively. For ZnO/carbonyl-iron composite, a reflection loss (RL) exceeding -20 dB was obtained in a broad frequency range of 8.4-17.9 GHz with a thin thickness of 1.2-2.3 mm. An optimal RL of -61 dB was found at 11.7 GHz for an absorber thickness of 1.91 mm. It is demonstrated that the attractive microwave-absorption properties are a consequence of a proper electro-magnetic impedance match and geometrical cancellation at the air-material interface. In addition, an impedance mismatch function was proposed, which provides an effective method to determine the microwave absorbing properties from the intrinsic materials constants. The calculated value of matching frequency and thickness is well consistent with the experimental data. The method also provides a simple theoretical graphic aid for determining the absorption characteristics and the location of the matching conditions in the frequency domain. (C) 2011 Elsevier B.V. All rights reserved.
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