Mechanisms for optimizing the dielectric properties of spinel Li10ZnTi13O32 ceramics by Na+ doping

Herein, the dielectric properties of Na  +  doped Li 10 ZnTi 13 O 32 ceramics were investigated by first-principles computational prediction and combined with the solid-phase reaction method. Li 9.88 Na 0.12 ZnTi 13 O 32 obtained the best dielectric properties by sintering at 1050 °C for 4 h: ε r  = 30.01, Q × f  = 90,879 GHz (@7.8 GHz), τ f  = 3.93 ppm/°C. In terms of extrinsic factors, the optimization of the densification, the creation of the second phase TiO 2, and the increase of the grain size resulted in better dielectric properties. Intrinsic factors indicate that the weakening of the damping behavior and the increase in the electron cloud density lead to a decrease in the dielectric loss. The increase in ion polarisation and the blue shift of the Raman wavenumber lead to a gradual increase in ε r . The temperature stability is optimized depending on the TiO 2 content. The optimized Li 9.88 Na 0.12 ZnTi 13 O 32 ceramics have unlimited applications in microwave communications.