Preparation and Microwave Absorption Property of the Core-Nanoshell Composite Materials Doped with Sm

Abstract:

The core-nanoshell composite materials doped with Sm were prepared by a solid-state reaction method. The core is magnetic fly-ash hollow cenosphere, and the shell is the nanosized ferrite doped with Sm. The thermal decomposition process of the sample was investigated by thermogravimetric analysis-differential scanning calorimetry ( TG- DSC ). The morphology and components of the composite materials were investigated by the X-ray diffraction analysis ( XRD ), scanning electron microscope ( SEM ) and energy disperse spectroscopy ( EDS ). The microwave absorption property was investigated by vector network analyzer ( VNA ). The results indicated that the exchange-coupling interaction happens between ferrite of magnetic fly-ash hollow cenosphere and nanosized ferrite coating. The exchange-coupling interaction enhances magnetic loss of composite materials. So, in the frequency between 1 MHz and 1 GHz, the absorbing effectiveness of the core-nanoshell composite absorbers can achieve –32 dB, it is better than single material and is consistent with requirements of the microwave absorbing material at the low-frequency absorption.

• Periodical: Advanced Materials Research (Volumes 356-360)
• Pages: 514-518
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.356-360.514
• Online since: October 2011
• Authors: Ru Xin Che, Bing Yu, Chun Xia Wang, Li Qiu Wei
• Keywords: Core-Nanoshell Composite Materials, Doped with Rare Earth, Magnetic Fly-Ash Hollow Cenosphere, Magnetic Property

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DOI: 10.1016/s1001-0742(11)61082-6