Enhanced broadband microwave absorption in Sm-substituted Z-type Ba3Co2Fe24O41 hexaferrites via composition tuning

IF 6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2026-10-01 Epub Date: 2026-07-23 DOI:10.1016/j.ceramint.2026.07.304

Cheng Qian, Qingzhe Yang, Chuangju Zhou, Kewei Zou, Weiwei Zhang, Qiangchun Liu, Min Zhang

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引用次数: 0

Abstract

In this work, a series of Sm-substituted Ba_3-xSm_xCo₂Fe₂₄O₄₁ (x = 0, 0.1, 0.15, 0.2, and 0.25) Z-type hexaferrites are synthesized via a sol-gel route. Phase analysis confirms that all samples crystallize in a single Z-type hexagonal structure without detectable impurity phases. By regulating the Sm substitution level, the magnetic properties and electromagnetic parameters of the hexaferrites are effectively tailored, leading to significantly enhanced microwave absorption performance. The saturation magnetization is improved upon Sm substitution, reaching 51.7 emu/g for the x = 0.2 sample, which is mainly attributed to the strengthened Fe³⁺-O-Fe²⁺ super-exchange interactions at the 12k and 2b crystallographic sites. Benefiting from optimized impedance matching and attenuation capability, the x = 0.2 sample exhibits the optimal comprehensive microwave absorption performance, delivering a minimum reflection loss (RL_min) of −57.4 dB at 12.08 GHz with an absorber thickness of 2.54 mm and an effective absorption bandwidth (EAB) of 7.84 GHz (7.04-14.88 GHz). When the thickness is slightly increased to 2.66 mm, the EAB is further broadened to 8.16 GHz (6.48-14.64 GHz), covering part of the C band, the entire X band, and part of the Ku band. For comparison, the x = 0.15 sample achieves an ultralow RL_min of −66.6 dB at 12.88 GHz with a thickness of 2.49 mm, but its broadband absorption performance is inferior to that of the x = 0.2 sample. The enhanced microwave absorption performance of the Sm-substituted hexaferrites is mainly attributed to the synergistic effects of improved impedance matching, enhanced dielectric loss associated with interfacial and dipolar polarization, and strengthened magnetic loss arising from natural and exchange resonances. These results demonstrate that Sm substitution is an effective strategy for achieving strong and broadband microwave absorption in Ba₃Co₂Fe₂₄O₄₁ Z-type (Co₂Z) hexaferrites.

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sm取代的z型Ba3Co2Fe24O41六铁氧体通过成分调谐增强宽带微波吸收

本文通过溶胶-凝胶法合成了一系列sm取代的Ba3-xSmxCo2Fe24O41 (x = 0,0.1,0.15,0.2和0.25)z型六铁体。相分析证实，所有样品结晶为单一的z型六角形结构，没有检测到杂质相。通过调节Sm取代水平，可以有效地定制六铁体的磁性能和电磁参数，从而显著提高微波吸收性能。Sm取代后饱和磁化强度得到提高，x = 0.2样品的饱和磁化强度达到51.7 emu/g，这主要是由于12k和2b晶体位置的Fe3+-O-Fe2+超交换相互作用增强所致。得益于优化的阻抗匹配和衰减能力，x = 0.2样品具有最佳的综合微波吸收性能，在12.08 GHz时的最小反射损耗（RLmin）为−57.4 dB，吸收器厚度为2.54 mm，有效吸收带宽（EAB）为7.84 GHz（7.04-14.88 GHz）。当厚度略微增加到2.66 mm时，EAB进一步展宽到8.16 GHz(6.48 ~ 14.64 GHz)，覆盖了部分C波段、整个X波段和部分Ku波段。相比之下，x = 0.15样品在12.88 GHz处的超低RLmin为- 66.6 dB，厚度为2.49 mm，但其宽带吸收性能不如x = 0.2样品。sm取代六铁氧体的微波吸收性能增强主要是由于阻抗匹配改善、界面极化和偶极极化引起的介电损耗增强以及自然共振和交换共振引起的磁损耗增强的协同作用。这些结果表明，Sm取代是实现Ba3Co2Fe24O41 z型（Co2Z）六铁体强宽带微波吸收的有效策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.