【摘 要】
：
The Z-type ferrites of nominal composition Ba3Co2Fe24O41+x wt％ Bi2O3, where x=0.25, 0.5, 1.0, 1.5, 2.0, were prepared by conventional ceramic processes. The influence of Bi2O3 content on the bulk densities, microstructures, magnetic and dielectric propert
【机 构】
：
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 4
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
The Z-type ferrites of nominal composition Ba3Co2Fe24O41+x wt％ Bi2O3, where x=0.25, 0.5, 1.0, 1.5, 2.0, were prepared by conventional ceramic processes. The influence of Bi2O3 content on the bulk densities, microstructures, magnetic and dielectric properties of Z-type ferrite samples were systematically examined so as to obtain materials with low magnetic and dielectric loss tangent over a frequency ranging from 600 to 800 MHz. The experimental results showed that addition of Bi2O3 lowered the sintering temperature (1020 ℃) and then reduced the average grain size (2.68×108 Ω?cm) dramatically, which consequently decreased the magnetic and dielectric loss. Additionally, the low loss factors were observed at the Bi2O3 content x = 1.0, i e, tan δμ/μ\' = 0.013 and tan δε/ε\' = 0.001 at 800 MHz, and such materials could be used for antennas miniaturization from 600 to 800 MHz.
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