Abstract
In this work, a novel anti-reduction mechanism was put up by substituting (Mg1/3Ta2/3)4+ complex ion for Ti4+ ion in Ba4.2Sm9.2Ti18-x(Mg1/3Ta2/3)xO54 (0 ≤ x ≤ 0.1) ceramics. The influence of (Mg1/3Ta2/3)4+ complex ion on the sintering behavior, crystal structure, anti-reduction mechanism and microwave dielectric properties of Ba4.2Sm9.2Ti18-x(Mg1/3Ta2/3)xO54 ceramics was investigated. The results indicated that Ba4.2Sm9.2Ti18-x(Mg1/3Ta2/3)xO54 ceramics maintained a typical single-phase tungsten bronze structure. After doping, the ceramic exhibited dense structure and typical columnar grains. Raman spectroscopy and XPS analysis confirmed the reduction of oxygen vacancies and obtained a 7.86 % decrease of Ti3+ ions. Due to the anti-reduction of Ti4+ ions, Ba4.2Sm9.2Ti18-x(Mg1/3Ta2/3)xO54 ceramics possessed an improvement in microwave dielectric properties. In Ba4.2Sm9.2Ti18-x(Mg1/3Ta2/3)xO54 (0 ≤ x ≤ 0.1) ceramics, the Ba4.2Sm9.2Ti17·95(Mg1/3Ta2/3)0.05O54 (x = 0.05) ceramic sintered at 1350 °C for 4 h showed the best integrated microwave dielectric properties with εr = 79.62, Qf = 10,450 GHz and τf = −10.66 ppm/°C.
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