Complex permittivity, permeability, and microwave absorption of barium ferrite by citrate sol-gel process
来源期刊：Rare Metals2003年第2期
论文作者：ZHANG Haijun WU Mingzhong YAOXi and ZHANG Liangying) High Temperature ceramics Institute, Zhengzhou University, Zhengzhou , China) Functional Materials Research, Laboratory, Tongji University, Shanghai , China (Received --)
文章页码：125 - 130
摘 要：<正> BaFe12O19 hexaferrites were prepared by citrate sol-gel process. The formation temperature was much lower than that of the conventional ceramic method. The complex dielectric constant and complex permeability of hexaferrite-paraffin wax 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 variation with the measuring frequency increase. It also showed that the real part of permeability decreased as the frequency increasing for all samples, the resonance phenomena due to domain wall resonance was observed in ?" spectra, the calcining temperature strongly affects the microwave properties of BaFe12O19 ferrites, the higher the calcining temperature, the lower the resonance frequency.
ZHANG Haijun WU Mingzhong YAOXi and ZHANG Liangying1) High Temperature ceramics Institute, Zhengzhou University, Zhengzhou 450052, China2) Functional Materials Research, Laboratory, Tongji University, Shanghai 200092, China (Received 2002-03-06)
摘 要：<正> BaFe12O19 hexaferrites were prepared by citrate sol-gel process. The formation temperature was much lower than that of the conventional ceramic method. The complex dielectric constant and complex permeability of hexaferrite-paraffin wax 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 variation with the measuring frequency increase. It also showed that the real part of permeability decreased as the frequency increasing for all samples, the resonance phenomena due to domain wall resonance was observed in ?" spectra, the calcining temperature strongly affects the microwave properties of BaFe12O19 ferrites, the higher the calcining temperature, the lower the resonance frequency.
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