Ultra-low εr in LiAlSiO4 microwave ceramics with Li excess

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL Journal of Alloys and Compounds Pub Date : 2024-11-29 DOI:10.1016/j.jallcom.2024.177848

Huiying Fan, Yun Zhang, Shihua Ding

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Abstract

Li_(1+x)AlSiO₄ ceramics were synthesized using the conventional solid-state reaction method. X-ray diffraction analysis indicated that they crystallized in single-phase hexagonal structure. Li loss was studied using the thermogravimetric-differential scanning calorimetry (TG-DSC). Appropriate excess Li resulted in sintering temperature reduction from 1325 ℃ to 1225 ℃. The ultra-low dielectric constant (ε_r) was influenced by the polarizability per unit volume. Theoretical calculations manifested that enhancing the packing fraction suppressed lattice vibrations, resulting in a significant increase in the quality factor (Q×f). Compared with the pure phase samples, adding Li ions optimized the thermal stability of the ceramics. Specifically, Li_1.02AlSiO₄ demonstrated optimal microwave dielectric properties with ε_r=4.13, Q×f=45,387 GHz and τ_f=-35.54 ppm/°C, making it a spacious application prospect in the field of 6 G communication.

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Li过量LiAlSiO4微波陶瓷的超低εr

采用常规固相反应法制备了Li(1+x)AlSiO4陶瓷。x射线衍射分析表明其结晶为单相六边形结构。采用热重-差示扫描量热法（TG-DSC）研究了锂的损失。适当过量的锂使烧结温度从1325℃降至1225℃。超低介电常数εr受单位体积极化率的影响。理论计算表明，填料分数的增加抑制了晶格振动，导致质量因子的显著增加（Q×f）。与纯相样品相比，Li离子的加入优化了陶瓷的热稳定性。其中，Li1.02AlSiO4具有最佳的微波介电性能，εr=4.13, Q×f=45,387 GHz, τf=-35.54 ppm/°C，在6g通信领域具有广阔的应用前景。

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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.