Liu Bing, Lin Feng Li, Song Kai Xin, Huang Yu Hui
College of Electronic Information and Engineering, Hangzhou Dianzi University, Hangzhou, Zhejiang 310018, China.
College of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China.
ACS Appl Mater Interfaces. 2024 Oct 16;16(41):55741-55750. doi: 10.1021/acsami.4c11411. Epub 2024 Oct 7.
The demand for high-performance microwave dielectric ceramics has surged with the proliferation of fifth-generation (5G) communication networks. In this work, SrLa(AlGaZnMgTi)O ( = 0-0.20) ceramics were designed by leveraging the unique properties of SrLaAlO ceramics and high-entropy engineering. The effects of configurational entropy ( = 1.23R - 1.54R) on the mechanical, thermal, and microwave dielectric properties of SrLa(AlGaZnMgTi)O ceramics were investigated. X-ray diffractometer and transmission electron microscope analyses confirmed that each composition belonged to the tetragonal structure with a space group of 4/. Significant improvements in Vickers hardness were observed with increasing , reaching 8.05 GPa at = 1.54R compared to 5.64 GPa in SrLaAlO ceramics. Additionally, the increasing entropy showed great potential in reducing the thermal expansion coefficient (CTE) from 12.32 to 11.49 ppm/°C. The optimal quality factor ( × ) of 98,000 GHz was achieved at = 1.37R, attributed to the optimization of intrinsic lattice energy and infrared-damped modes. The temperature coefficient of resonant frequency (τ) was successfully modified toward zero due to entropy-driven CTE and structural modifications. Excellent microwave dielectric properties with ε = 22.5, = 98,000 GHz, and τ = -2.0 ppm/°C were obtained at = 1.37R. This work highlights the potential of entropy-engineering in developing high-performance microwave dielectric ceramics, offering a promising pathway for the advancement of 5G communication components.
随着第五代（5G）通信网络的普及，对高性能微波介电陶瓷的需求激增。在这项工作中，通过利用SrLaAlO陶瓷的独特性能和高熵工程设计了SrLa(AlGaZnMgTi)O（ = 0 - 0.20）陶瓷。研究了组态熵（ = 1.23R - 1.54R）对SrLa(AlGaZnMgTi)O陶瓷的力学、热学和微波介电性能的影响。X射线衍射仪和透射电子显微镜分析证实，每种成分都属于四方结构，空间群为4/。随着 的增加，维氏硬度显著提高，在 = 1.54R时达到8.05 GPa，而SrLaAlO陶瓷为5.64 GPa。此外，熵的增加在将热膨胀系数（CTE）从12.32降低到11.49 ppm/°C方面显示出巨大潜力。在 = 1.37R时实现了98,000 GHz的最佳品质因数（ × ），这归因于本征晶格能和红外阻尼模式的优化。由于熵驱动的CTE和结构改性，谐振频率温度系数（τ）成功调整为零。在 = 1.37R时获得了优异的微波介电性能，ε = 22.5， = 98,000 GHz，τ = -2.0 ppm/°C。这项工作突出了熵工程在开发高性能微波介电陶瓷方面的潜力，为5G通信组件的发展提供了一条有前途的途径。
