High-entropy enhanced microwave dielectric performance

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering Pub Date : 2025-04-23 DOI:10.1016/j.compositesb.2025.112545

Linzhao Ma, Jianhong Duan, Longxiang Jiang, Qianbiao Du, Kun Wei, Tian Liu, Hao Li

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引用次数: 0

Abstract

Microwave dielectric ceramics with excellent dielectric properties are essential for microwave devices. However, developing microwave dielectric ceramics with optimal permittivity (ε_r), a high quality factor (Q×f), and a near-zero temperature coefficient of resonant frequency (τ_f) remains a significant challenge. We propose a high-entropy design with local disordered ionic displacement in spinel-structural ceramics. This strategy stabilizes the phase structure by lowering the Gibbs free energy and enhances the performance of ceramics through lattice distortion, sluggish diffusion kinetics, and multi-component synergy. Benefiting from the synergistic effect, we achieved excellent properties in high-entropy spinel ceramics, including a ε_r of 10.33, a high Q×f of 120,545 GHz, a near-zero τ_f of −10.7 ppm/°C, as well as a Vickers hardness of 9.98 GPa and a flexural strength of 134.1 MPa. Furthermore, the resonant antenna designed based on high-entropy ceramics satisfies the application requirements for 5G/6G communications. This work demonstrates that the high-entropy strategy is an advanced method for the development of high-performance microwave dielectric ceramics and antennas.

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高熵增强微波介电性能

微波介质陶瓷具有优良的介电性能，是微波器件必不可少的材料。然而，开发具有最佳介电常数（εr）、高品质因子（Q×f）和近零谐振频率温度系数（τf）的微波介电陶瓷仍然是一个重大挑战。我们提出了尖晶石结构陶瓷中具有局部无序离子位移的高熵设计。该策略通过降低吉布斯自由能来稳定相结构，并通过晶格畸变、缓慢扩散动力学和多组分协同作用来提高陶瓷的性能。得益于协同效应，我们获得了高熵尖晶石陶瓷的优异性能，包括εr为10.33，Q×f为120,545 GHz， τf为- 10.7 ppm/°C，维氏硬度为9.98 GPa，抗弯强度为134.1 MPa。此外，基于高熵陶瓷设计的谐振天线满足5G/6G通信的应用需求。这一工作表明，高熵策略是开发高性能微波介质陶瓷和天线的一种先进方法。

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来源期刊

Composites Part B: Engineering 工程技术-材料科学：复合

CiteScore

24.40

自引率

11.50%

发文量

784

审稿时长

21 days

期刊介绍： Composites Part B: Engineering is a journal that publishes impactful research of high quality on composite materials. This research is supported by fundamental mechanics and materials science and engineering approaches. The targeted research can cover a wide range of length scales, ranging from nano to micro and meso, and even to the full product and structure level. The journal specifically focuses on engineering applications that involve high performance composites. These applications can range from low volume and high cost to high volume and low cost composite development. The main goal of the journal is to provide a platform for the prompt publication of original and high quality research. The emphasis is on design, development, modeling, validation, and manufacturing of engineering details and concepts. The journal welcomes both basic research papers and proposals for review articles. Authors are encouraged to address challenges across various application areas. These areas include, but are not limited to, aerospace, automotive, and other surface transportation. The journal also covers energy-related applications, with a focus on renewable energy. Other application areas include infrastructure, off-shore and maritime projects, health care technology, and recreational products.