| Summary: | In this work, (1-x)Li<sub>2</sub>TiO<sub>3</sub>-xLi<sub>4</sub>NbO<sub>4</sub>F ceramics were prepared by the conventional solid-state ceramic route. With the increase of Li<sub>4</sub>NbO<sub>4</sub>F content, the phase structure transformed from ordered monoclinic to disordered cubic. By increasing Li<sub>3</sub>NbO<sub>4</sub>F content, the temperature coefficient of resonant frequency (<i>τ</i><sub>f</sub>) was successfully adjusted closer to zero, while the dielectric constant (ε<sub>r</sub>) and microwave quality factor (Q<i>f</i>) decreased to some degree. Outstanding microwave dielectric properties with a ε<sub>r</sub> = 18.7, Q<i>f</i> = 61,388 GHz (6.264 GHz), and <i>τ</i><sub>f</sub> = 0.9 ppm/°C were obtained for 0.9Li<sub>2</sub>TiO<sub>3</sub>-0.1Li<sub>4</sub>NbO<sub>4</sub>F ceramics sintered at 1050 °C for 2 h, which indicated that these ceramics are suitable for practical applications in the field of microwave substrates and components.
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