Structure/property dynamics of low-temperature sintering pure and Mg-modified Zn3V2O8 ceramics

The pure and Mg-modified Zn ₃V ₂O ₈ ceramics were successfully synthesized using the solid-state reaction. Zn ₃V ₂O ₈ is well crystallized as the orthorhombic phase with a space group of Cmca. The Zn site of Zn ₃V ₂O ₈ ceramic can be partially substituted by Mg to form a continuous solid solution. Appropriate substitution can tremendously enhance the dielectric chartcteristics of the samples. P-V-L bond theory was also employed to investigate the structural and chemical bond effects on the microwave dielectric properties of the specimens. Raman spectrum was sensitive to crystallinity, and can highly reflect the dielectric loss of the ceramics. The Zn ₃V ₂O ₈ ceramic sintered at 690°C reveals a high Q× f =59,000 GHz, along with an ε _r =13.8, and τ _f =–120 ppm/°C. Remarkably, the Zn _2.99Mg _0.01V ₂O ₈ specimen demonstrates outstanding properties, with ε _r =14.7, Q× f =86,000 GHz and τ _f =–82 ppm/°C. This signifies an approximately 46 % improvement in Q× f compared to pure Zn ₃V ₂O ₈, indicating the ceramic`s great promise for low-temperature co-fired ceramic (LTCC) applications, especially in high-frequency regions where low dielectric loss is essential.