Abstract
Effects of Ca substitution for Ba on the phase composition, microstructure, sintering behavior and microwave dielectric properties of nominal ceramics Ba1-xCaxV2O6 (0.2 ≤ x ≤ 0.5) were investigated. The XRD, Raman and SEM results revealed that BaV2O6 and CaV2O6 composite ceramics were formed. Nominal ceramics Ba1-xCaxV2O6 could be well densified at about 550 °C via a solid-state reaction method. The microwave dielectric properties exhibited strong dependence on the composition and microstructure. Typically, the Ba0.7Ca0.3V2O6 ceramics sintered at 550 °C exhibited excellent microwave dielectric properties: er = 10.9, Qxf = 17,100 GHz (at 9.9 GHz), and τf = 4 ppm/°C. Meanwhile, Ba0.7Ca0.3V2O6 ceramics also showed good chemical compatibility with Al electrode. These results indicated that the Ba0.7Ca0.3V2O6 ceramics could be a promising candidate for the ULTCC technology.
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