Dielectric relaxation and microwave absorption properties of aurivillius-type multiferroic ceramics
Dielectric relaxation and microwave absorption properties of aurivillius-type multiferroic ceramics
复制标题
aurivilius型多铁陶瓷的介电弛豫和微波吸收性能
DOI：
10.1016/j.ceramint.2018.03.023
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发表时间：
2018-06
影响因子：
5.2
通讯作者：
Lu Yalin
中科院分区：
文献类型：
--
作者：
Sun Shujie;Chen Wenjin;Fang Liang;Cheng Nian;Xiao Zhenyu;Zhao Zhiqiang;Tian Yongshang;Lu Yalin
Aurivillius型多铁性氧化物由于其具有良好的光、电、磁等性能，在多功能领域有着广泛的应用前景。在这里，我们报告的单相Aurivillius型陶瓷的介电弛豫，电磁性能和高性能的微波吸收的原始观察。两个热激活的弛豫过程中确定的介电损耗峰在低温和高温下的频率依赖性行为。在2-18 GHz频率下测量了复介电常数和磁导率，并从实验确定的电磁参数计算了微波衰减性能。值得注意的是，阻尼的介电和磁共振在12-14 GHz的清晰观察和优异的微波吸收性能是第一次提出，是敏感的样品厚度。不同厚度下的最小反射损耗（RL）均超过− 30 dB。特别是，最小RL在13.2 GHz时达到− 70.1 dB，吸收带宽（RL≤ −20 dB）接近12 GHz（5.7-17.7 GHz）。该工作为开发Aurivillius型多铁氧化物电磁波衰减材料开辟了一条新途径。
Aurivillius-type multiferroic oxides are increasingly being studied for potential application in multifunctional areas because of their feasible platforms incubating photonic, electric, magnetic, etc. properties. Here, we report the original observations of the dielectric relaxation, electromagnetic properties and high-performance microwave absorption of the single-phase Aurivillius-type ceramics. Two thermally activated relaxation processes were determined by the frequency-dependent behaviour of the dielectric loss peak at low and high temperatures. The complex permittivity and permeability were measured at frequencies 2–18 GHz and the microwave attenuation performances were calculated from the experimentally determined electromagnetic parameters. Significantly, the damped dielectric and magnetic resonances were clearly observed at 12–14 GHz and the excellent microwave absorption properties were presented for the first time and are sensitive to the sample thickness. The minimum reflection loss (RL) surpasses − 30 dB at different thicknesses. Especially, the minimum RL reaches − 70.1 dB at 13.2 GHz and the absorption bandwidth (RL≤ −20 dB) is close to 12 GHz (5.7–17.7 GHz). This work opens up a new pathway to develop Aurivillius-type multiferroic oxides in electromagnetic wave attenuation materials.
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