A novel synthesis of porous Ba2Co2Mn1.2Fe10.8O22/carbon composites for high efficiency electromagnetic wave absorption

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Ceramics International Pub Date : 2024-09-30 DOI:10.1016/j.ceramint.2024.09.393

Yongkang Lai , Feng Tian , Yu Gao , Chen Li , Qikui Man , Baogen Shen

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Abstract

Designing an electromagnetic wave (EMW) absorbing material with ultra-wide effective absorption bandwidth (EAB) and low filling ratio is the key to solving the problem of electromagnetic pollution. In this study, the porous Ba₂Co₂Mn_1.2Fe_10.8O₂₂/C (Mn-Co₂Y/C) composites were prepared by radial freeze-drying method as well as high temperature carbonization process (400 °C, 500 °C, 600 °C, and 700 °C). The research results indicate that the sample annealed at 600 °C exhibits superior EMW absorption properties, achieving the widest EAB of 5.77 GHz at a thickness of 1.7 mm, which is attributed to the synergistic effect of multiple reflections of EMWs within microchannels of the samples and the interfacial polarization between Mn-Co₂Y ferrite and C material. Samples prepared at 600 °C have the best impedance matching, which makes it easier for EMWs to enter the material, thus exhibiting better EMW absorption performance. The magnetic loss mainly originates from natural resonance at low frequencies and eddy current loss at high frequencies, and the dielectric loss stems from relaxation loss and conductivity loss.

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用于高效电磁波吸收的多孔 Ba2Co2Mn1.2Fe10.8O22/carbon 复合材料的新型合成方法

设计一种具有超宽有效吸收带宽（EAB）和低填充率的电磁波（EMW）吸收材料是解决电磁污染问题的关键。本研究采用径向冷冻干燥法和高温碳化工艺（400 °C、500 °C、600 °C和700 °C）制备了多孔Ba2Co2Mn1.2Fe10.8O22/C（Mn-Co2Y/C）复合材料。研究结果表明，在 600 ℃ 下退火的样品具有优异的电磁波吸收特性，在厚度为 1.7 mm 时实现了 5.77 GHz 的最宽 EAB，这归因于样品微通道内电磁波的多重反射以及 Mn-Co2Y 铁氧体和 C 材料之间的界面极化的协同效应。在 600 °C 下制备的样品具有最佳阻抗匹配，这使得电磁波更容易进入材料，从而表现出更好的电磁波吸收性能。磁损耗主要源于低频的自然共振和高频的涡流损耗，介电损耗源于弛豫损耗和电导损耗。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.