Crystal structure, Raman spectrum, and bond characteristics of Ca1-xZnxV2O6 microwave dielectric ceramic with low sintering temperature

• Published in: Materials research bulletin 2024-02, Vol.170, p.112587, Article 112587
• Main Authors: Qing, Zhenjun, Zhou, Xin, Zou, Huapeng, Li, Haiyan, Li, Yingxiang
• Format: Article
• Language: English
• Subjects: Chemical bonding; Crystal structure; P-V-L theory; Raman spectroscopy; XRD refinement
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2023.112587

•The impact of Zn2+ substitution for Ca2+ on dielectric properties in CaV2O6 was analyzed using the P-V-L theory.•The investigation focused on understanding the relationship between structural parameters and dielectric performance.•Optimal microwave dielectric properties (εr = 10.3, q × f = 67,850 GHz, τf = −57.3 ppm/ °C) were achieved at x = 0.09. Ca1-xZnxV2O6 (CZVO) ceramics were successfully synthesized using the solid-state reaction method, confirming the presence of only monoclinic CaV2O6 phase through XRD analysis. Introduction of Zn2+ increased the εr by modifying the polarization. The Q × f was found to be influenced by packing fraction, while the τf value was affected by the distortion of [CaO6] octahedra. Investigation of chemical bonding theory revealed a close relationship between the ionicity of the V-O bond and the εr. Optimization of the Q × f value involved increasing the lattice energy, while improving τf required strengthening the bond energy. Raman spectroscopy showed a negative correlation between the Q × f and the FWHM of the corresponding Raman peak. Ca0.91Zn0.09V2O6 ceramic sintered at 700 °C demonstrated the following microwave performance: εr of 10.3, Q × f of 67,850 GHz, and τf of -57.3 ppm/°C. Co-firing results indicated poor chemical compatibility between CZVO ceramics and silver. [Display omitted]