Effect of adding Sn4+ on crystal structure, sintering behaviors, and microwave dielectric properties of La2Zr3(MoO4)9 ceramics

La-2(Zr1-xSnx)(3)(MoO4)(9) (0.02 <= x <= 0.10) (LZMS) materials were successfully synthesized to scientifically investigate the effects of Sn4+ addition on phase composition, microstructures, lattice vibration, and dielectric response at microwave frequency. XRD patterns indicate that all samples belong to the trigonal crystal (S.G. R3-c). The crystallite size and lattice strain were analyzed using the Willimson-Hall equation. According to the apparent density and SEM, the LZMS ceramics achieved a dense and homogeneous microstructure when sintered at 700 degrees C. Analysis of the microwave dielectric properties revealed that the ceramics with x = 0.06 sintered at 700 degrees C achieved excellent performances (Qf = 75,508 GHz, epsilon(r) = 10.18, tau(f) = -22.21 ppm/degrees C). The far-infrared reflectance spectrum shows that the theoretical permittivity of the ceramic was mainly from the absorption of phonon vibrations below 400 cm(-1). Consequently, the La-2(Zr0.94Sn0.06)(3)(MoO4)(9) ceramic has excellent microwave dielectric properties and can be used as a material for 5G communication devices.