Low-temperature sintering and microwave dielectric properties of Ca2Zn4Ti15O36 ceramics

The sintering behavior, microstructures, and microwave dielectric properties of Ca2Zn4Ti15O36 ceramics with B2O3 addition were investigated. The crystalline phases and microstructures of Ca2Zn4Ti15O36 ceramics with 0–10 wt% B2O3 addition were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS). The sintering temperature of Ca2Zn4Ti15O36 ceramic was lowered from 1170 to 930 °C by 10 wt% B2O3 addition. Ca2Zn4Ti15O36 ceramics with 8 wt% B2O3 addition sintered at 990 °C for 2 h exhibited good microwave dielectric properties, i.e., a quality factor (Qf) 11,400 GHz, a relative dielectric constant (εr) 41.5, and a temperature coefficient of resonant frequency (τf) 94.4 ppm/°C.