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