Two low-firing microwave dielectric ceramics Na 2 LnMg 2 V 3 O 12 (Ln = Pr, Yb) and their chemical compatibility with silver

摘要: Two low-firing Na2LnMg2V3O12 (Ln = Pr, Yb) ceramics were prepared by the conventional solid-state reaction method, and sintering behavior, phase purity, microwave dielectric properties investigated. Both crystallized in a cubic garnet structure could be well densified below 900 °C. Na2PrMg2V3O12 sintered at 860 °C/4 h had er 12.6, Q × f 15,040 GHz, τf −45.1 ppm/°C, Na2YbMg2V3O12 possessed optimum with 13.1, 22,040 −59.2 ppm/°C when 820 h. LiCa2Mg2V3O12 was chosen as compensator to tailor thermal stability of due same its large positive value. Temperature-stable based on (1−x) Na2LnMg2V3O12–xLiCa2Mg2V3O12 obtained near-zero values +0.5 −1.6 respectively, compounds did not react commonly used silver electrodes.