Enhanced electromagnetic properties and microwave attenuation of BiFeO3-BaFe7(MnTi)2.5O19 driven by multi-relaxation and strong ferromagnetic resonance
Enhanced electromagnetic properties and microwave attenuation of BiFeO3-BaFe7(MnTi)2.5O19 driven by multi-relaxation and strong ferromagnetic resonance
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DOI：
10.1016/j.matdes.2016.07.119
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发表时间：
2016-11
影响因子：
8.4
通讯作者：
Yong Li;M. Cao
中科院分区：
文献类型：
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作者：
Yong Li;M. Cao
报道了在X波段首次观测到BiFeO_3-BaFe_7(MnTi)_(2.5O)_(19)复合材料的电磁性能和微波衰减性能。研究发现，BiFeO_3-BaFe_7(MnTi)_(2.5)O_(19)的介电常数表现为介电多重驰豫行为，这对保持高的介电损耗起着重要的作用。同时，BiFeO_3-BaFe_7(MnTi)_(2.5)O_(19)由于强的铁磁共振表现出更大的磁损耗。对于所有BiFeO_3-BaFe_7(MnTi)_(2.5)O_(19)复合材料，最小反射损耗均超过−约20分贝。特别是体积比为2：1和3：1的复合材料的最小反射损耗达到−=50dB，几乎是BiFeO_3的3倍。微波衰减的增强归因于电磁特性的改善和电磁匹配。这项工作为微波衰减材料在成像、医疗保健、信息安全和军事领域的发展开辟了一条很有前途的可行途径。
We report the original observation of the electromagnetic properties and microwave attenuation performances of BiFeO3-BaFe7(MnTi)2.5O19composites in X-band. It is found that the permittivity of BiFeO3-BaFe7(MnTi)2.5O19shows dielectric multi-relaxation behavior, which plays an important role in maintaining the high dielectric loss. Meanwhile, BiFeO3-BaFe7(MnTi)2.5O19exhibits increased magnetic loss due to strong ferromagnetic resonance. For all BiFeO3-BaFe7(MnTi)2.5O19composites, the minimum reflection loss surpasses − 20 dB. Especially, the minimum reflection loss of the composites with volume ratio of 2:1 and 3:1 reaches − 50 dB, which is almost 3 times of that of BiFeO3. The enhanced microwave attenuation is attributed to the improved electromagnetic properties and electromagnetic matching. This work opens up a promising feasible route to development of microwave attenuation materials in imaging, healthcare, information safety and military fields.