Microstructure, bonding characteristics, far-infrared spectra and microwave dielectric properties of co-substituted Ce2[(Zr1-x(Zn1/3Sb2/3)x]3(MoO4)9 ceramics.

In this contribution, Ce 2 [(Zr 1- x (Zn 1/3 Sb 2/3) x ] 3 (MoO 4) 9 (CZ 1− x (ZS) x) (0 ≤ x ≤ 0.1) ceramics were fabricated using the solid-state reaction method, and the phase composition of the synthesized ceramics was analyzed via XRD and Rietveld refinement. The outcomes revealed that the ceramics, characterized by different x values, constituted a solitary phase with an R-3C space group, and the cell volume demonstrated a decrease with an increase in x value. The examination of the ceramics microwave dielectric characteristics using P–V−L theory reveals that the f i (Ce – O(6)) bond was found to be related to ε r , while Q × f was influenced by the average grain size and U ave. (Mo – O) , and E ave. (Mo – O) and α ave. (Mo – O) were related to the τ f value. The optimal properties were achieved at 750 °C (x = 0.02), resulting in ε r = 10.08, Q × f = 100,954 GHz, τ f = −12.46 ppm/°C. The infrared reflection spectrum analysis revealed that the primary polarization contribution was due to the dielectric response of intrinsic phonons. Additionally, the effects of three different complex ions (Zn 1/2 Sb 2/3)4+, (Zn 1/2 Ta 2/3)4+, and (Zn 1/2 Nb 2/3)4+ doping on the properties of Ce 2 Zr 3 (MoO 4) 9 ceramics were investigated using SEM, packing fraction, and chemical bond analysis. The results showed that (Zn 1/2 Sb 2/3)4+ doping was effective in improving the grain size and apparent density of Ce 2 Zr 3 (MoO 4) 9 ceramics, and the high packing fraction and U (Mo – O) were found to be the primary intrinsic factors for the optimal properties. [ABSTRACT FROM AUTHOR]