Microstructures and microwave dielectric properties of low-temperature sintered Ca ₂Zn ₄Ti ₁₅O ₃₆ ceramics

Low-temperature sintered Ca ₂Zn ₄Ti ₁₅ O ₃₆ microwave dielectric ceramic was prepared by conventional solid state reaction method. The influences from V ₂ O ₅ addition on the sintering behavior, crystalline phases, microstructures and microwave dielectric properties were investigated. The crystalline phases and microstructures of Ca ₂ Zn ₄Ti ₁₅O ₃₆ ceramic with V ₂ O ₅ addition were investigated by X-ray diffraction, scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). V ₂O ₅ addition lowered the sintering temperature of Ca ₂Zn ₄Ti ₁₅O ₃₆ ceramics from 1140 °C to 930 °C. Ca ₂Zn ₄ Ti ₁₅O ₃₆ ceramic with 5wt% V ₂ O ₅ addition could be densified well at 930°C, and showed good microwave dielectric properties of ετ _r∼ 46, Q × f ∼ 13400 GHz, and temperature coefficient of resonant frequency (τ _f)∼164 ppm/°C.