Crystal structure, infrared-reflectivity spectra, and microwave dielectric properties of novel Ce2(MoO4)2(Mo2O7) ceramics

Novel Ce-2(MoO4)(2)(Mo2O7) (CMO) ceramics were prepared by a conventional solid-state method, and the microwave dielectric properties were investigated. X-ray diffraction results illustrated that pure Ce-2(MoO4)(2)(Mo2O7) structure formed upon sintering at 600 degrees C-725 degrees C. [CeO7], [CeO8], [MoO4], and [MoO6] polyhedra were connected to form a three-dimensional structure of CMO ceramics. Analysis based on chemical bond theory indicated that the Mo-O bond critically affected the ceramics' performance. Furthermore, infrared-reflectivity spectra analysis revealed that the primary polarisation contribution was from ionic polarisation. Notably, the optimum microwave dielectric properties of epsilon(r) = 10.69, Q.f = 49,440 GHz (@ 9.29 GHz), and tau(f) = -30.4 ppm/degrees C were obtained in CMO ceramics sintered at 700 degrees C.

Automated summary

Novel Ce-2(MoO4)(2)(Mo2O7) (CMO) ceramics were prepared using a solid-state method, exhibiting optimum microwave dielectric properties after sintering at 700 degrees C. Ionic polarization was identified as the primary contribution to the ceramics' performance, with the Mo-O bond playing a critical role.