Crystal structure and optimised microwave dielectric properties of Ce2(Zr1-xTix)3(MoO4)9 solid solutions. Issue 4 (15th February 2021)

• Record Type: Journal Article
• Authors: Zheng, Jinjie; Liu, Yinghao; Tao, Bingjing; Zhang, Qiang; Wu, Haitao; Zhang, Xiaoyu
• Is Part Of: Ceramics international. Volume 47:Issue 4(2021)
• Page Start: 5624
• Page End: 5630
• Publication Date: 2021-02-15
• Subjects: Microwave dielectric properties -- Crystal structure -- Ce2(Zr1-xTix)3(MoO4)9 -- Far-infrared spectrum; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.10.147
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Ce2 (Zr1-x Tix )3 (MoO4 )9 (CZ1-x Tx M) (x = 0.02–0.10) solid solutions were prepared via solid-state reaction method. The effects of Ti 4+ ions substituting for Zr 4+ on sintering behavior, structure and microwave dielectric properties of Ce2 Zr3 (MoO4 )9 ceramics were investigated. X-ray diffraction (XRD) patterns combined with Rietveld refinements results confirmed that all compounds crystallized in a trigonal cell ( R-3c ). The Q·f values of the as-prepared samples were explained by the packing fraction and average grain size. Dielectric polarizability played a significant role in affecting the permittivity, and the τ f values were associated with the bond valence of Zr-site. What's more, far-infrared reflectivity spectra were also used to explore the intrinsic dielectric properties of Ce2 (Zr1-x Tix )3 (MoO4 )9 (x = 0.08) ceramics. Typically, the desirable microwave dielectric properties of Ce2 (Zr1-x Tix )3 (MoO4 )9 ceramics were achieved in x = 0.08 when sintered at 775 °C for 6 h: ε r = 11.28, Q·f = 84, 200 GHz and τ f = −7.86 ppm/°C.