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Chin J Mater Res  2009, Vol. 23 Issue (6): 652-655    DOI:
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Doping effect of SiO2 on electromagnetic properties for FeCo nanocrystalline magnetic powders
PANG Yongqiang ; CHENG Haifeng ; TANG Gengping ; XING Xin
Key Lab of School of Aerospace and Material Engineering; National University of Defense Technology; Changsha 410073
Cite this article: 

PANG Yongqiang CHENG Haifeng TANG Gengping XING Xin. Doping effect of SiO2 on electromagnetic properties for FeCo nanocrystalline magnetic powders. Chin J Mater Res, 2009, 23(6): 652-655.

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Abstract  

The FeCo/SiO2 nanocrystalline magnetic powders were prepared from the mixtures of carboxyl iron, cobalt and SiO2 powders by the simple ball-milling method. The microstructure was characterized by XRD and SEM. Doping effect on electromagnetic parameters was investigated by vector network analyzer for FeCo nanocrystalline magnetic powders doped with SiO2. The results show that impurity of SiO2 in the FeCo nanocrystalline exists in the form of amorphous phase and the doping can greatly modify the microwave  lectromagnetic properties of the magnetic powders. As compared to the pure FeCo nanocrystalline powders, doping of SiO2 significantly decreases the real and imaginary parts of complex permittivity of magnetic powders, but corresponding complex permeability changes slightly.
Consequently, it is obvious that this is an availability way to improve the impedance matching of absorbers.

Key words:  metallic materials       nanocrystlline magnetic powders       SiO2       complex permittivity        com-plex permeability     
Received:  06 March 2009     
ZTFLH: 

O482

 
Fund: 

Supported by National Nature Science Foundation of China No.50802114.

URL: 

https://www.cjmr.org/EN/     OR     https://www.cjmr.org/EN/Y2009/V23/I6/652

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