Complex permittivity, permeability, and microwave absorption of barium ferrite by citrate sol-gel process

稀有金属（英文版）, 2003, 22(2): 125-130.

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1.High Temperature ceramics Institute, Zhengzhou University, Zhengzhou 450052, China

2.Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China

3.Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China

4.Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China

基金项目: 国家自然科学基金(59995320.4)

Complex permittivity, permeability, and microwave absorption of barium ferrite by citrate sol-gel process

Keywords： BaFe12O19

BaFe12O19 hexaferrites were prepared by citrate sol-gel process. The formation temperature was much lower thanthat of the conventional ceramic method. The complex dielectric constant and complex permeability of hexaferrite-paraffinwax composites had been measured by the transmission/reflection coaxial line method in the range from 200 MHz to 6 GHz.The measurement results showed that both the complex dielectric constant and dielectric loss exhibited no significant varia-tion with the measuring frequency increase. It also showed that the real part of permeability decreased as the frequency in-creasing for all samples, the resonance phenomena due to domain wall resonance was observed in μ" spectra, the calciningtemperature strongly affects the microwave properties of BaFe12O19 ferrites, the higher the calcining temperature, the lowerthe resonance frequency.

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Complex permittivity, permeability, and microwave absorption of barium ferrite by citrate sol-gel process

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