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

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.