Evaluation of influence of the sintering behavior and chemical bonding on the microwave dielectric properties of Mn₂V₂O₇ ceramics

Mn₂V₂O₇ ceramics were synthesized via the solid-state method and the sintering behavior, phase transition, and chemical bonding on the microwave dielectric properties of the specimens were systematically investigated. The prepared ceramics exhibit a monoclinic structure with a C2/m (12) space group. A maximum relative density of 96.7 % and uniform grain morphology were obtained for sample sintered at 810 °C, while it also exhibited an impressive combination of microwave dielectric properties: ε_r = 15.1, Q×f = 58,000 GHz, and τ_f = –52 ppm/°C. Additionally, the P–V–L bond theory was employed to calculate chemical bond ionicity, lattice energy, and bond energy, which were then correlated with the measured dielectric properties. The results indicate that microwave dielectric properties of the Mn₂V₂O₇ ceramics were highly correlated to bond iconicity, lattice energy and bond energy.