Sintering characteristics, crystal structure, and microwave dielectric properties of Ce2[Zr1-x(Al1/2Nb1/2)x]3(MoO4)9 ceramics.

This work prepared a new type of Ce 2 [Zr 1- x (Al 1/2 Nb 1/2) x ] 3 (MoO 4) 9 (CZ 1- x (AN) x M) (x = 0.02–0.10) microwave dielectric ceramics through the solid-phase process. CZ 1- x (AN) x M ceramics exhibited low dielectric constant, ultra-low dielectric loss, and near-zero resonant frequency temperature coefficient, which is suitable for 5 G technology. The effects of (Al 1/2 Nb 1/2)4+ replacing Zr4+ on the sintering characteristics, crystal structure, and microwave dielectric properties of Ce 2 Zr 3 (MoO 4) 9 (CZM) ceramics were studied systematically. In this work, CZ 1- x (AN) x M could form a pure crystal structure in the whole doping range according to the X-ray diffraction pattern. The crystal cell parameters of the ceramics were confirmed by Rietveld refinement analysis. Furthermore, the surface morphology of CZ 1- x (AN) x M sintered at the optimum sintering temperature was studied by scanning electron microscopy. Some internal parameters of the ceramics were calculated and analyzed by employing the P-V-L theory. The theoretical loss was acquired by employing an infrared reflection spectrometer. When x was 0.04 and the sintering temperature was 850 ℃, the best properties were achieved, including ε r = 10.54, Q·f = 91,476 GHz (at 9.55 GHz), and τ f = − 8.95 ppm/℃. This work studied the relationship between lattice vibration and microwave dielectric properties and discussed the influence of ion doping on microwave dielectric properties from the perspective of chemical bonds, laying a theoretical foundation for related research. [Display omitted] • The intrinsic factor of the permittivity was analyzed by IR reflectance spectroscopy. • The cell parameters were obtained through the Rietveld refinement method. • The effects of (Al 1/2 Nb 1/2)4+ the properties were explored based on the P-V-L theory. • Excellent properties including, ε r = 10.54, Q·f = 91,476 GHz, and τ f = − 8.95 ppm/℃. [ABSTRACT FROM AUTHOR]