科研之友
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摘要
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 degrees 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 degrees C-930 degrees C). The Sr2NaMg2V3O12 ceramic sintered at 900 degrees C obtained the optimum microwave dielectric properties with a relative permittivity of 11.7, a Qxf of 37 950 GHz (at 11.0 GHz), and a almost zero (f) value of -2.9 ppm/degrees C. Chemical compatibility experiments showed no reaction between Sr2NaMg2V3O12 ceramics and Ag electrodes.
