Sintering behavior, crystal structure and dielectric properties of novel ULTCC Li2BW2O8 (B = Cu, Co) ceramics for antenna design

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-02-24 DOI:10.1016/j.jallcom.2025.179418

Yiwen Ma, Wenjie Zhang, Yanjun Liu, Qinglan Yang, Fangyi Huang, Huanfu Zhou

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引用次数: 0

Abstract

Ultra-low temperature co-fired ceramics (ULTCC) play a pivotal role in the development of 5 G and modern microwave communications. This paper presents a comprehensive analysis of the microstructure, crystal structure and microwave dielectric properties of Li₂BW₂O₈ (B = Cu, Co) ceramics. The Rietveld refinement of X-ray diffractograms indicates that Li₂BW₂O₈ (B = Cu, Co) ceramics belong to the triclinic crystal system with P-1 symmetry. Furthermore, structure-performance correlation analysis has found that the two series of ceramics achieve excellent performance due to their density, packing fraction and lattice energy, with Li₂CuW₂O₈ ceramics sintered at 660 ℃ exhibiting ε_r = 12.06, Q×f = 24526.17 GHz, τ_f = -81.94 ppm/℃ and Li₂CoW₂O₈ ceramics sintered at 620 ℃ showing ε_r = 12.38, Q×f = 24980.47 GHz, τ_f = -78.75 ppm/℃. Moreover, the ceramics display excellent chemical stability with the Al electrode, indicating that they are ideal candidates for ULTCC applications. Finally, the Li₂CoW₂O₈ ceramic was designed as a dielectric resonator antenna resonating at 5.34 GHz with high efficiency (more than 80%) and realized gain (5.75 dBi), confirming it is a good candidate for 5 G communications.

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天线设计用新型ULTCC Li2BW2O8 （B = Cu, Co）陶瓷的烧结性能、晶体结构和介电性能

超低温共烧陶瓷（ULTCC）在5g和现代微波通信的发展中起着举足轻重的作用。本文全面分析了Li2BW2O8 （B = Cu, Co）陶瓷的微观结构、晶体结构和微波介电性能。x射线衍射图的Rietveld细化表明，Li2BW2O8 （B = Cu, Co）陶瓷属于P-1对称的三斜晶系。此外，结构-性能相关分析发现，两系陶瓷在密度、填充率和晶格能方面均取得了优异的性能，660℃烧结Li2CuW2O8陶瓷的εr = 12.06, Q×f = 24526.17 GHz, τf = -81.94 ppm/℃；620℃烧结Li2CoW2O8陶瓷的εr = 12.38, Q×f = 24980.47 GHz, τf = -78.75 ppm/℃。此外，陶瓷与Al电极表现出优异的化学稳定性，表明它们是ULTCC应用的理想候选者。最后，Li2CoW2O8陶瓷被设计为5.34 GHz的介质谐振器天线，具有高效率（80%以上）和实现增益（5.75 dBi），是5g通信的理想选择。

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

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.