Crystal structure, bond energy, Raman spectra, and microwave dielectric properties of Ti‐doped Li <sub>3</sub> Mg <sub>2</sub> NbO <sub>6</sub> ceramics
Gang Wang, Dainan Zhang, Jie Li, Gongwen Gan, Yiheng Rao, Xin Huang, Yan Yang, Liang Shi, Yulong Liao, Cheng Liu, Lichuan Jin, Huaiwu Zhang
Abstract
Abstract Crystal structure exerts dominant influence on the microwave dielectric performance enabling satisfying the demands for 5G communication system. In this study, the Ti‐doped Li 3 Mg 2 Nb 1‐x Ti x O 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 NbO 6 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.