Abstract
Single-phase polycrystalline microwave dielectric ceramics Ba6Ti1−xSnxNb4O18, with x changing from 0 to 1, were synthesized by the solid-state reaction method. All the solid solutions fitted well with A6B5O18 cation-deficient hexagonal perovskite structure. The substitution of Sn for Ti effectively enhanced the quality factor and controlled τf. With increasing Sn content, the dielectric constant decreased from ∼47 to ∼32, and the Q×f value increased significantly from 11 530 to 28 496 GHz, with τf varying from 64 to 0 ppm/°C. A zero τf was realized when Sn was fully replaced by Ti with the composition Ba6SnNb4O18.
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