Microwave Absorbing Properties of W-Type Hexaferrite Ba(MnZn)_xCo_2(1-x)Fe₁₆O₂₇

Xianming Qin, Ying Cheng, Kesheng Zhou, Shengxiang Huang, Xia Hui

School of Physics and Electronics, Central South University, Changsha, China.
Xiamen Hongye Project Build Technique Co. Ltd., Xiamen, China.

DOI: 10.4236/msce.2013.14002                

Abstract

MnZn-doped W-type barium cobalt ferrite powder composites of Ba(MnZn)_xCo_2(1-x)Fe₁₆O₂₇ (x = 0.1, 0.2, 0.3, 0.4, and 0.5) were prepared in a sol-gel process. The microwave absorbing properties of the composites in the range of 2 - 18 GHz and their electromagnetic loss mechanisms were studied. The results demonstrated that the synthesized Ba(MnZn)_xCo_2(1-x)Fe₁₆O₂₇ samples possess a W-type phase of the crystal structure with a hexagonal flaky shape in micro-morphology, and the samples exhibited a soft magnetic trait that enables improving their microwave absorption properties through suitable MnZn doping. For Ba(MnZn)_0.4Co_1.2Fe₁₆O₂₇ with a thickness of 2.8 mm, the reflection loss peak was -40.7 dB at a frequency of 7.3 GHz, with a bandwidth of 6.6 GHz at a loss of less than -10 dB. The microwave absorption primarily resulted from magnetic losses caused by magnetization relaxation, domain wall resonance, and natural resonance.

Keywords

Sol-Gel Process; W-Type Ferrite; Microwave Absorbing Materials; Electromagnetic Loss

Conflicts of Interest

The authors declare no conflicts of interest.

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