Crystal structure, infrared-reflectivity spectra, and microwave dielectric properties of novel Ce2(MoO4)2(Mo2O7) ceramics. Issue 22 (15th November 2021)

• Record Type: Journal Article
• Authors: Tian, Huanrong; Liu, Lintao; Du, Jialun; Wu, Haitao; Li, MingLing; Tao, Bingjing
• Is Part Of: Ceramics international. Volume 47:Issue 22(2021)
• Page Start: 31375
• Page End: 31382
• Publication Date: 2021-11-15
• Subjects: Ce2(MoO4)2(Mo2O7) -- Chemical bond theory -- Infrared-reflectivity spectra -- Microwave dielectric ceramic; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.08.011
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Novel Ce2 (MoO4 )2 (Mo2 O7 ) (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 (Mo2 O7 ) 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 ε r = 10.69, Q·f = 49, 440 GHz (@ 9.29 GHz), and τ f = −30.4 ppm/°C were obtained in CMO ceramics sintered at 700 °C.