A Novel Temperature Stable Microwave Dielectric Ceramic with Garnet Structure: Sr2NaMg2V3O12

A garnet vanadate ceramic Sr2NaMg2V3O12 was prepared by the conventional solid‐state route, and the sinterability, microwave dielectric properties, and its chemical compatibility with Ag electrodes were investigated. Sr2NaMg2V3O12 sample could be well sintered at 900°C for 4 h with a relative density of 96.1%. X‐ray diffraction data showed that Sr2NaMg2V3O12 ceramics crystallized into a cubic garnet structure with a space group Ia‐3d over the sintering temperature range (830°C–930°C). The Sr2NaMg2V3O12 ceramic sintered at 900°C obtained the optimum microwave dielectric properties with a relative permittivity of 11.7, a Q×f of 37 950 GHz (at 11.0 GHz), and a almost zero τf value of −2.9 ppm/°C. Chemical compatibility experiments showed no reaction between Sr2NaMg2V3O12 ceramics and Ag electrodes.