Effects of (Cr0.5Ta0.5)4+ on the microstructure, chemical bond characteristics, and dielectric properties of molybdate-based ceramics at microwave and terahertz frequency. Issue 8 (15th April 2023)

• Record Type: Journal Article
• Authors: Feng, Zhanbai; Guo, Weijia; Xu, Xiaoyu; Li, Hu; Chen, Yueguang; Zhang, Yuping; Du, Jialun; Wu, Haitao; Duan, Guangbin; Yue, Zhenxing
• Is Part Of: Ceramics international. Volume 49:Issue 8(2023)
• Page Start: 12633
• Page End: 12642
• Publication Date: 2023-04-15
• Subjects: Microwave dielectric properties -- Chemical bond characteristic -- Rietveld refinement -- Infrared spectrum -- Terahertz time-domain spectrum; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.12.126
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this study, Ce2 [Zr1− x (Cr0.5 Ta0.5 ) x ]3 (MoO4 )9 ( x = 0.02–0.10) ceramics were synthesized using the solid-state reaction technique, and the crystalline parameters, sintering behaviors, chemical bond characteristics, infrared reflection spectrum, and dielectric response at microwave and terahertz frequency were examined. X-ray diffraction results demonstrated the crystallization of all ceramics in the trigonal structure (R-3c space group), and additional peaks were not detected. The densification point of ceramic was 875 °C. The addition of (Cr0.5 Ta0.5 ) 4+ significantly reduced the dielectric loss in the host ceramic. For Ce2 [Zr0.96 (Cr0.5 Ta0.5 )0.04 ]3 (MoO4 )9, outstanding microwave properties of ε r = 10.66, Qf = 79, 436 GHz, and τ f = −19.07 ppm/°C were obtained at 875 °C. The chemical bond characteristics were also parameterized to explore the relationship between Zr(CrTa)–O and microwave properties. Infrared spectral results further indicate that phonon vibrations lower than 400 cm −1 contribute to 80% of the polarization. In our comparison between the infrared spectrum and terahertz time-domain spectrum, we found that the permittivity extracted by the latter is closer to the observed value.