Crystal structure exerts dominant influence on the microwave dielectric performance enabling satisfying the demands for 5G communication system. In this study, the Ti‐doped Li₃Mg₂Nb_1‐xTi_xO_6‐x/2 (x  = 0.0‐0.1) ceramics were prepared by the solid‐state reaction procedure. Crystal structure refinement and microstructure analysis indicate pure phase with orthorhombic structure and homogeneous microstructure with grain size (~14 μm). The relative permittivity was affected by the relative density, cell volume, and polarizability. The Q × f value was dominated by the Nb‐O bond energy and grain size. The τ _f value was correlated with the NbO₆ octahedral distortion and Nb‐O bond valence. Particularly, the composition (x  = 0.04) exhibited remarkable microwave dielectric performance: ε _r = 15.88, Q × f  = 131 000 GHz and τ _f = −26.8 ppm/°C, providing a promising candidate for millimeter‐wave applications.

中文翻译：

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掺Ti的Li3Mg2NbO6陶瓷的晶体结构，键能，拉曼光谱和微波介电性能

晶体结构对微波介电性能产生主要影响，可以满足5G通信系统的需求。在这项研究中， 通过固相反应程序制备了掺杂Ti的Li ₃ Mg ₂ Nb _1-x Ti _x O _{6-x / 2}（x = 0.0-0.1）陶瓷。晶体结构的细化和微观结构分析表明，具有正交晶结构的纯相和具有晶粒尺寸（〜14μm）的均匀微观结构。相对介电常数受相对密度，泡孔体积和极化率的影响。的Q×˚F值通过将Nb-O的键能和晶粒尺寸支配。该τ _˚F值与NbO ₆八面体形变和Nb-O键价相关。特别地，该组合物（X  = 0.04）表现出显着的微波介电性能：ε _{- [R}  = 15.88，Q×˚F  = 131 000 GHz和τ _˚F  = -26.8 PPM /℃，对于毫米波应用提供有希望的候选。