Structure, bond features, and microwave dielectric properties of Li2(Mg1−xCax)2(MoO4)3 ceramics for ULTCC application

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2024-08-21 DOI:10.1111/jace.20074

Shumin Duan, Zhenjun Qing, An Liu, Haiyan Li, Yan Xue

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Abstract

Ultra-low temperature sintered ceramics, Li₂(Mg₁₋_xCa_x)₂(MoO₄)₃ (x = 0.025–0.100), were synthesized using the solid-phase method. XRD analysis revealed that adding Ca²⁺ increased the second-phase CaMoO₄ content. Particularly, Li₂(Mg_0.975Ca_0.025)₂(MoO₄)₃ ceramics exhibited excellent properties: ε_r = 9.31, Q × f = 55,400 GHz, and τ_f = −38.9 ppm/°C. Incorporating Ca²⁺ significantly improved the performance of ceramics. The microwave dielectric properties of Li₂(Mg_0.9Ca_0.1)₂(MoO₄)₃ ceramics sintered at 650°C showed enhancements: ε_r of 9.55, Q × f of 63,500 GHz, and τ_f of −10.8 ppm/°C. The rise in ε_r can be attributed to polarizability, while a higher packing fraction led to a larger Q × f value, and the reduced distortion of the [Li/Mg/CaO₆] octahedra enhanced the τ_f value. Moreover, the increased of CaMoO₄ also positively influenced the ceramic's properties. Furthermore, in accordance with the principles of complex chemical bonding, the elevation of ionicity, lattice energy, and bond energy of the Mo–O bond contributed to the enhancement of ε_r, Q × f, and τ_f, respectively. Raman spectroscopy showed a positive correlation between dielectric loss and full width at half maximum of the Raman peak. Good chemical compatibility between silver and Li₂(Mg_0.9Ca_0.1)₂(MoO₄)₃ ceramic was demonstrated through our co-firing experiment.

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超超临界陶瓷应用中 Li2(Mg1-xCax)2(MoO4)3陶瓷的结构、键合特征和微波介电性能

采用固相法合成了超低温烧结陶瓷 Li2(Mg1-xCax)2(MoO4)3 (x = 0.025-0.100)。XRD 分析表明，添加 Ca2+ 增加了第二相 CaMoO4 的含量。特别是，Li2(Mg0.975Ca0.025)2(MoO4)3 陶瓷表现出优异的性能：εr = 9.31，Q × f = 55,400 GHz，τf = -38.9 ppm/°C。加入 Ca2+ 能显著提高陶瓷的性能。在 650°C 下烧结的 Li2(Mg0.9Ca0.1)2(MoO4)3 陶瓷的微波介电性能有所提高：εr 为 9.55，Q × f 为 63,500 GHz，τf 为 -10.8 ppm/°C。εr的升高可归因于极化性，而更高的堆积分数则导致更大的Q × f值，[Li/Mg/CaO6]八面体畸变的减少则提高了τf值。此外，CaMoO4 的增加也对陶瓷的性能产生了积极影响。此外，根据复杂化学键的原理，Mo-O 键的离子度、晶格能和键能的提高分别促进了 εr、Q × f 和 τf 值的提高。拉曼光谱显示介电损耗与拉曼峰的半最大全宽呈正相关。通过共烧实验证明了银与 Li2(Mg0.9Ca0.1)2(MoO4)3 陶瓷之间良好的化学相容性。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.