Abstract
Two novel microwave dielectric ceramics Na2AMg2V3O12 (A=Nd, Sm) with cubic garnet structure were obtained by the conventional solid-state reaction method. Both ceramics could be well densified at 850°C for 4h. The Na2NdMg2V3O12 (NNMV) ceramic exhibited good microwave dielectric properties with a permittivity εr of 12, a quality factor Qu×f value of 26,544GHz (at 10GHz) and a negative temperature coefficient of resonant frequency τf value of −63ppm/°C and the Na2SmMg2V3O12 (NSMV) ceramic had a εr of 12.1, a Qu×f value of 36,207GHz (at 9.8GHz) and a negative τf value of −69ppm/°C. The large negative τf values could be compensated by forming solid solution with LiCa2Mg2V3O12 and 0.7Na2AMg2V3O12 (A=Nd, Sm)–0.3LiCa2Mg2V3O12 sintered at 880°C for 4h exhibited a near zero τf ~−4.5ppm/°C and 5.5ppm/°C, respectively. Both ceramics were found to be chemically compatible with Ag electrode at 850°C for 4h. These merits make them promising candidates for low-temperature co-fired ceramic technology (LTCC).
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