کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1804982 | 1024665 | 2007 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Microwave absorbing properties of rare-earth elements substituted W-type barium ferrite Microwave absorbing properties of rare-earth elements substituted W-type barium ferrite](/preview/png/1804982.png)
W-type barium ferrites Ba(MnZn)0.3Co1.4R0.01Fe15.99O27 with R=Dy, Nd and Pr were prepared by chemical coprecipitation method. Effects of rare-earth elements (RE) substitution on microstructural and electromagnetic properties were analyzed. The results show that a small amount of RE3+ ions can replace Fe3+ ions and adjust hyperfine parameters. An obvious increase in natural resonance frequency and high frequency relaxation, and a sharp decrease for complex permittivity have been observed. Furthermore, the matching thickness and the reflection loss (RL) of one-layer ferrite absorber were calculated. It reveals that thin and broad-band can be obtained by RE-substitution. But only when the magnetic moment of RE3+ is higher than that of Fe3+, can substitution be effective for higher RL. Dy-substituted ferrite composite has excellent microwave absorption properties. The frequency (with respect to −10 dB RL) begins from 9.9 GHz, and the bandwidth reaches far more than 8.16 GHz. The peak value is −51.92 dB at a matching thickness of 2.1 mm.
Journal: Journal of Magnetism and Magnetic Materials - Volume 312, Issue 2, May 2007, Pages 310–313