Effect of Na_2W_2O_7 addition on low-temperature sintering and microwave dielectricproperties of CaWO_4

摘要

Effects of Na_2W_2O_7 addition on low-temperature sintering, microstructure and microwave dielectric properties of CaWO_4 were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and microwave dielectric resonator methods in this paper. The CaWO_4 material could be sintered into a dense ceramic (-96% theoretical density) at 850 ℃/2 h without affecting its microwave dielectric properties greatly by adding appropriate amount of Na_2W_2O_7. The XRD results showed that CaW04 main phase with trace amount of Na_2W_2O_7 second phase was observed in (1 - x) CaWO4-xNa_2W_2O_7 (0