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Volume 15, Issue 6, 2006
LETTER: MECHANISM OF INCREASING THE ELECTROMAGNETIC ABSORPTION OF COMPOSITES PREPARED BY BaFe12O19 and TiO2
Jianxun Qiu*, Lijuan Lan, Hong Zhang
School of Environmental and Materials Engineering, Yantai University, Yantai 264005, China
* Author to whom correspondence should be addressed: E-mail: jianxun_qiu@yahoo.com.cn
Received 6 August 2006 ; accepted 9 January 2007
ABSTRACT
The composites of BaFe12O19 and TiO2 are prepared with sol-gel method. The imaginary parts of the relative complex permittivity and permeability, sublattice structure, and saturation magnetization of composites were measured with vector network analysis, Mfssbauer spectroscopy, and vibrating sample magnetometry. The doping by TiO2 changes the sublattice structure of BaFe12O19, and results in the quadrupole splitting and isomer shifts. The capabilities of dielectric and magnetic losses of BaFe12O19 are improved. The effect of the doping by TiO2 on improving the energy absorption of BaFe12O19 is analyzed.
KEYWORDS: Barium ferrite; Titanium dioxide; Dielectric loss; Magnetic loss; Sublattice structure |
