Low dielectric loss in vanadium-based zircon ceramics via high-entropy strategy  

作　　者：Yuheng Zhang Huaicheng Xiang Xiaoyu Wu Yang Zhou Ying Tang Liang Fang 

机构地区：[1]College of Physics and Electronic Information Engineering,Guilin University of Technology,Guilin 541004,China [2]Guangxi Universities Key Laboratory of Non-Ferrous Metal Oxide Electronic Functional Materials and Devices,Guangxi Key Laboratory of Optical and Electronic Materials and Devices,College of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,China

出　　处：《Journal of Advanced Ceramics》2025年第1期151-161,共11页先进陶瓷(英文)

基　　金：supported by the Natural Science Foundation of Guangxi Zhuang Autonomous Region(No.2023GXNSFBA026076);the Science and Technology Plan of Guangxi(No.ZY22096019);the National Natural Science Foundation of China(No.52462016).

摘　　要：Zircon ceramics have potential applications in next-generation wireless communication because of their low permittivity and adjustable temperature coefficient at microwave frequencies.However,the vast challenge of realizing ultralow dielectric loss still exists.Here,we propose a high-entropy strategy to enhance the bonding of the A-site dodecahedron in zircon and design(Nd_(0.2)Eu_(0.2)Y_(0.2)Ho_(0.2)Yb_(0.2))VO_(4) ceramics with a high quality factor(high Q×f,that is,low dielectric loss).The(Nd_(0.2)Eu_(0.2)Y_(0.2)Ho_(0.2)Yb_(0.2))VO_(4) high-entropy ceramics,which belong to the tetragonal zircon structure with the I4_(1)/amd space group,exhibit a low relative permittivity(ε_(r)=11.55),a negative temperature coefficient of resonant frequency(τ_(f)=−37.3 ppm/℃),and a high Q×f of 76,400 GHz(at 12.31 GHz).The high Q×f value can be attributed to the high chemical bond strength and structural stability.Furthermore,the relationship between the crystal structure and the microwave dielectric properties of(Nd_(0.2)Eu_(0.2)Y_(0.2)Ho_(0.2)Yb_(0.2))VO_(4) high-entropy ceramics was analyzed through high resolution transmission electron microscopy(HRTEM),Raman spectroscopy,far-infrared reflection spectroscopy,and chemical bond theory.This work provides an effective avenue for designing microwave dielectric materials with low loss to meet the demands of passive components.

关 键 词：high-entropy ceramics vanadium-based zircon microwave dielectric properties low dielectric loss chemical bond characteristics 

分 类 号：TB383.3[一般工业技术—材料科学与工程]