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

• Published in: Ceramics international Vol. 47; no. 22; pp. 31375 - 31382
• Main Authors: Tian, Huanrong, Liu, Lintao, Du, Jialun, Wu, Haitao, Li, MingLing, Tao, Bingjing
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.11.2021
• Subjects: Ce2(MoO4)2(Mo2O7); Chemical bond theory; Infrared-reflectivity spectra; Microwave dielectric ceramic; Infrared-reflectivity spectra; Ce2(MoO4)2(Mo2O7); Microwave dielectric ceramic; Chemical bond theory
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2021.08.011

Novel Ce2(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 Ce2(MoO4)2(Mo2O7) structure formed upon sintering at 600 °C-725 °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 εr = 10.69, Q·f = 49,440 GHz (@ 9.29 GHz), and τf = −30.4 ppm/°C were obtained in CMO ceramics sintered at 700 °C.