Abstract
TiO2-added Ba4(Sm0.65Nd0.35)9.33Ti17.75Al0.33O54 (BSNTA) ceramics were fabricated with a solid-state reaction method. Slight TiO2 addition increased the dielectric constant (εr) of BSNTA ceramics and brought about a near-zero temperature coefficient of resonant frequency (τf). Sintering in oxygen increased the density of TiO2-added BSNTA ceramics and surprisingly concurrently improved the εr and Q × f value. Thermally stimulated depolarization current (TSDC) measurements indicated that TiO2 addition introduced oxygen vacancies (VO..) and TiTi'−VO.. defect dipoles and that an oxygen-sufficient sintering atmosphere decreased the concentration of these defects and thus increased Q × f values. From the viewpoint of defect behaviors, this observation offered original insight into the mechanism by which the sintering atmosphere had impacts on the Q × f value of titanate ceramics. Satisfying dielectric properties (εr = 79.5, Q × f = 14,840 GHz, τf = 0 ppm/°C) were attained in oxygen-sintered BSNTA-0.6%TiO2 ceramics that might be suitable for the manufacture of miniature microwave devices such as filters and antennas.
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